161899974 has 24 divisors (see below), whose sum is σ = 352817712. Its totient is φ = 53653680.

The previous prime is 161899963. The next prime is 161899979. The reversal of 161899974 is 479998161.

161899974 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161899974.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161899979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22882 + ... + 29109.

It is an arithmetic number, because the mean of its divisors is an integer number (14700738).

Almost surely, 2^161899974 is an apocalyptic number.

161899974 is an abundant number, since it is smaller than the sum of its proper divisors (190917738).

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

161899974 is a wasteful number, since it uses less digits than its factorization.

161899974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52172 (or 52169 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 161899974 is about 12723.9920622421. The cubic root of 161899974 is about 545.0239576484.

The spelling of 161899974 in words is "one hundred sixty-one million, eight hundred ninety-nine thousand, nine hundred seventy-four".