161565392 has 20 divisors (see below), whose sum is σ = 314847780. Its totient is φ = 80314368.

The previous prime is 161565389. The next prime is 161565401. The reversal of 161565392 is 293565161.

It can be written as a sum of positive squares in 2 ways, for example, as 120912016 + 40653376 = 10996^2 + 6376^2 .

It is a super-2 number, since 2×161565392² = 52206751784227328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26417 + ... + 31952.

It is an arithmetic number, because the mean of its divisors is an integer number (15742389).

Almost surely, 2^161565392 is an apocalyptic number.

It is an amenable number.

161565392 is a deficient number, since it is larger than the sum of its proper divisors (153282388).

161565392 is a wasteful number, since it uses less digits than its factorization.

161565392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58550 (or 58544 counting only the distinct ones).

The product of its digits is 48600, while the sum is 38.

The square root of 161565392 is about 12710.8375805845. The cubic root of 161565392 is about 544.6482504263.

The spelling of 161565392 in words is "one hundred sixty-one million, five hundred sixty-five thousand, three hundred ninety-two".