161243136 has 140 divisors (see below), whose sum is σ = 483691692. Its totient is φ = 53747712.

The previous prime is 161243129. The next prime is 161243143. The reversal of 161243136 is 631342161.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Jordan-Polya number, since it can be written as (4!)² ⋅ (3!)⁷.

161243136 is a `hidden beast` number, since 1 + 612 + 43 + 1 + 3 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (161243129) and next prime (161243143).

It is a super-2 number, since 2×161243136² = 51998697814228992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 53747711 + 53747712 + 53747713.

Almost surely, 2^161243136 is an apocalyptic number.

161243136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161243136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241845846).

161243136 is an abundant number, since it is smaller than the sum of its proper divisors (322448556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161243136 is an frugal number, since it uses more digits than its factorization.

161243136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53 (or 5 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 161243136 is about 12698.1548265880. The cubic root of 161243136 is about 544.2858935546.

Adding to 161243136 its reverse (631342161), we get a palindrome (792585297).

The spelling of 161243136 in words is "one hundred sixty-one million, two hundred forty-three thousand, one hundred thirty-six".