161915392 has 20 divisors (see below), whose sum is σ = 323515566. Its totient is φ = 80957440.

The previous prime is 161915389. The next prime is 161915399. The reversal of 161915392 is 293519161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 148254976 + 13660416 = 12176^2 + 3696^2 .

It is not an unprimeable number, because it can be changed into a prime (161915399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157609 + ... + 158632.

Almost surely, 2^161915392 is an apocalyptic number.

It is an amenable number.

161915392 is a deficient number, since it is larger than the sum of its proper divisors (161600174).

161915392 is an frugal number, since it uses more digits than its factorization.

161915392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316259 (or 316243 counting only the distinct ones).

The product of its digits is 14580, while the sum is 37.

The square root of 161915392 is about 12724.5979111326. The cubic root of 161915392 is about 545.0412582743.

The spelling of 161915392 in words is "one hundred sixty-one million, nine hundred fifteen thousand, three hundred ninety-two".