161921922 has 16 divisors (see below), whose sum is σ = 325473600. Its totient is φ = 53702352.

The previous prime is 161921869. The next prime is 161921939. The reversal of 161921922 is 229129161.

161921922 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, 66613 + ... + 69000.

It is an arithmetic number, because the mean of its divisors is an integer number (20342100).

Almost surely, 2^161921922 is an apocalyptic number.

161921922 is an abundant number, since it is smaller than the sum of its proper divisors (163551678).

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

161921922 is a wasteful number, since it uses less digits than its factorization.

161921922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135817.

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

The square root of 161921922 is about 12724.8544981858. The cubic root of 161921922 is about 545.0485852935.

The spelling of 161921922 in words is "one hundred sixty-one million, nine hundred twenty-one thousand, nine hundred twenty-two".