161291922 has 16 divisors (see below), whose sum is σ = 351909792. Its totient is φ = 48876320.

The previous prime is 161291833. The next prime is 161291951. The reversal of 161291922 is 229192161.

161291922 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 1221843 + ... + 1221974.

It is an arithmetic number, because the mean of its divisors is an integer number (21994362).

Almost surely, 2^161291922 is an apocalyptic number.

161291922 is an abundant number, since it is smaller than the sum of its proper divisors (190617870).

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

161291922 is a wasteful number, since it uses less digits than its factorization.

161291922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443833.

The product of its digits is 3888, while the sum is 33.

The square root of 161291922 is about 12700.0756690659. The cubic root of 161291922 is about 544.3407813774.

The spelling of 161291922 in words is "one hundred sixty-one million, two hundred ninety-one thousand, nine hundred twenty-two".