161938902 has 16 divisors (see below), whose sum is σ = 326850480. Its totient is φ = 53484192.

The previous prime is 161938901. The next prime is 161938937. The reversal of 161938902 is 209839161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161938901) 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, 123153 + ... + 124460.

It is an arithmetic number, because the mean of its divisors is an integer number (20428155).

Almost surely, 2^161938902 is an apocalyptic number.

161938902 is an abundant number, since it is smaller than the sum of its proper divisors (164911578).

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

161938902 is a wasteful number, since it uses less digits than its factorization.

161938902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247727.

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

The square root of 161938902 is about 12725.5216788940. The cubic root of 161938902 is about 545.0676368656.

The spelling of 161938902 in words is "one hundred sixty-one million, nine hundred thirty-eight thousand, nine hundred two".