161831976 has 32 divisors (see below), whose sum is σ = 428379840. Its totient is φ = 50770688.

The previous prime is 161831947. The next prime is 161831983. The reversal of 161831976 is 679138161.

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, 197916 + ... + 198731.

It is an arithmetic number, because the mean of its divisors is an integer number (13386870).

Almost surely, 2^161831976 is an apocalyptic number.

It is an amenable number.

161831976 is an abundant number, since it is smaller than the sum of its proper divisors (266547864).

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

161831976 is a wasteful number, since it uses less digits than its factorization.

161831976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396673 (or 396669 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 161831976 is about 12721.3197428569. The cubic root of 161831976 is about 544.9476435971.

The spelling of 161831976 in words is "one hundred sixty-one million, eight hundred thirty-one thousand, nine hundred seventy-six".