161825972 has 24 divisors (see below), whose sum is σ = 353075520. Its totient is φ = 63048960.

The previous prime is 161825929. The next prime is 161825987. The reversal of 161825972 is 279528161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262397 + ... + 263012.

It is an arithmetic number, because the mean of its divisors is an integer number (14711480).

Almost surely, 2^161825972 is an apocalyptic number.

It is an amenable number.

161825972 is an abundant number, since it is smaller than the sum of its proper divisors (191249548).

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

161825972 is a wasteful number, since it uses less digits than its factorization.

161825972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525431 (or 525429 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 161825972 is about 12721.0837588627. The cubic root of 161825972 is about 544.9409042901.

The spelling of 161825972 in words is "one hundred sixty-one million, eight hundred twenty-five thousand, nine hundred seventy-two".