161038992 has 40 divisors (see below), whose sum is σ = 416562624. Its totient is φ = 53609344.

The previous prime is 161038991. The next prime is 161038993. The reversal of 161038992 is 299830161.

It is an interprime number because it is at equal distance from previous prime (161038991) and next prime (161038993).

It is a self number, because there is not a number n which added to its sum of digits gives 161038992.

It is not an unprimeable number, because it can be changed into a prime (161038991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45478 + ... + 48890.

Almost surely, 2^161038992 is an apocalyptic number.

161038992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161038992 is an abundant number, since it is smaller than the sum of its proper divisors (255523632).

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

161038992 is a wasteful number, since it uses less digits than its factorization.

161038992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4407 (or 4401 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 161038992 is about 12690.1139474790. The cubic root of 161038992 is about 544.0560964355.

The spelling of 161038992 in words is "one hundred sixty-one million, thirty-eight thousand, nine hundred ninety-two".