161131152 has 160 divisors (see below), whose sum is σ = 526688512. Its totient is φ = 41306112.

The previous prime is 161131147. The next prime is 161131213. The reversal of 161131152 is 251131161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161118 + ... + 162114.

Almost surely, 2^161131152 is an apocalyptic number.

161131152 is a gapful number since it is divisible by the number (12) 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 161131152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263344256).

161131152 is an abundant number, since it is smaller than the sum of its proper divisors (365557360).

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

161131152 is a wasteful number, since it uses less digits than its factorization.

161131152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065 (or 1059 counting only the distinct ones).

The product of its digits is 180, while the sum is 21.

The square root of 161131152 is about 12693.7446011805. The cubic root of 161131152 is about 544.1598614667.

Subtracting 161131152 from its reverse (251131161), we obtain a palindrome (90000009).

The spelling of 161131152 in words is "one hundred sixty-one million, one hundred thirty-one thousand, one hundred fifty-two".