161931154 has 48 divisors (see below), whose sum is σ = 323132544. Its totient is φ = 59368320.

The previous prime is 161931127. The next prime is 161931173. The reversal of 161931154 is 451139161.

161931154 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25987 + ... + 31609.

It is an arithmetic number, because the mean of its divisors is an integer number (6731928).

Almost surely, 2^161931154 is an apocalyptic number.

161931154 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161931154 is a deficient number, since it is larger than the sum of its proper divisors (161201390).

161931154 is a wasteful number, since it uses less digits than its factorization.

161931154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5671 (or 5660 counting only the distinct ones).

The product of its digits is 3240, while the sum is 31.

The square root of 161931154 is about 12725.2172476544. The cubic root of 161931154 is about 545.0589437693.

The spelling of 161931154 in words is "one hundred sixty-one million, nine hundred thirty-one thousand, one hundred fifty-four".