161501536 has 48 divisors (see below), whose sum is σ = 367506720. Its totient is φ = 68428800.

The previous prime is 161501533. The next prime is 161501567. The reversal of 161501536 is 635105161.

It is a super-2 number, since 2×161501536² = 52165492260718592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161501531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15886 + ... + 23986.

It is an arithmetic number, because the mean of its divisors is an integer number (7656390).

Almost surely, 2^161501536 is an apocalyptic number.

161501536 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 161501536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183753360).

161501536 is an abundant number, since it is smaller than the sum of its proper divisors (206005184).

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

161501536 is an equidigital number, since it uses as much as digits as its factorization.

161501536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8207 (or 8199 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 161501536 is about 12708.3254601069. The cubic root of 161501536 is about 544.5764866218.

Adding to 161501536 its reverse (635105161), we get a palindrome (796606697).

The spelling of 161501536 in words is "one hundred sixty-one million, five hundred one thousand, five hundred thirty-six".