161520924 has 48 divisors (see below), whose sum is σ = 384975360. Its totient is φ = 52693440.

The previous prime is 161520899. The next prime is 161520971. The reversal of 161520924 is 429025161.

It is a junction number, because it is equal to n+sod(n) for n = 161520891 and 161520900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192097 + ... + 192935.

It is an arithmetic number, because the mean of its divisors is an integer number (8020320).

Almost surely, 2^161520924 is an apocalyptic number.

It is an amenable number.

161520924 is an abundant number, since it is smaller than the sum of its proper divisors (223454436).

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

161520924 is a wasteful number, since it uses less digits than its factorization.

161520924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1168 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 161520924 is about 12709.0882442447. The cubic root of 161520924 is about 544.5982775940.

The spelling of 161520924 in words is "one hundred sixty-one million, five hundred twenty thousand, nine hundred twenty-four".