161031642 has 16 divisors (see below), whose sum is σ = 325191360. Its totient is φ = 53155872.

The previous prime is 161031623. The next prime is 161031653. The reversal of 161031642 is 246130161.

161031642 is digitally balanced in base 2, 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 7 ways as a sum of consecutive naturals, for example, 129667 + ... + 130902.

It is an arithmetic number, because the mean of its divisors is an integer number (20324460).

Almost surely, 2^161031642 is an apocalyptic number.

161031642 is an abundant number, since it is smaller than the sum of its proper divisors (164159718).

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

161031642 is a wasteful number, since it uses less digits than its factorization.

161031642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260677.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 161031642 is about 12689.8243486661. The cubic root of 161031642 is about 544.0478191997.

The spelling of 161031642 in words is "one hundred sixty-one million, thirty-one thousand, six hundred forty-two".