161981692 has 12 divisors (see below), whose sum is σ = 283650640. Its totient is φ = 80938656.

The previous prime is 161981683. The next prime is 161981713. The reversal of 161981692 is 296189161.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5592 + ... + 18847.

Almost surely, 2^161981692 is an apocalyptic number.

It is an amenable number.

161981692 is a deficient number, since it is larger than the sum of its proper divisors (121668948).

161981692 is a wasteful number, since it uses less digits than its factorization.

161981692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26100 (or 26098 counting only the distinct ones).

The product of its digits is 46656, while the sum is 43.

The square root of 161981692 is about 12727.2028348730. The cubic root of 161981692 is about 545.1156413699.

The spelling of 161981692 in words is "one hundred sixty-one million, nine hundred eighty-one thousand, six hundred ninety-two".