161321976 has 64 divisors (see below), whose sum is σ = 474487200. Its totient is φ = 50609664.

The previous prime is 161321971. The next prime is 161322013. The reversal of 161321976 is 679123161.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161321976.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161321971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18295 + ... + 25638.

Almost surely, 2^161321976 is an apocalyptic number.

It is an amenable number.

161321976 is an abundant number, since it is smaller than the sum of its proper divisors (313165224).

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

161321976 is a wasteful number, since it uses less digits than its factorization.

161321976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43965 (or 43955 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 161321976 is about 12701.2588352494. The cubic root of 161321976 is about 544.3745888193.

The spelling of 161321976 in words is "one hundred sixty-one million, three hundred twenty-one thousand, nine hundred seventy-six".