161565393 has 32 divisors (see below), whose sum is σ = 241984512. Its totient is φ = 95054400.

The previous prime is 161565389. The next prime is 161565401. The reversal of 161565393 is 393565161.

It is not a de Polignac number, because 161565393 - 2² = 161565389 is a prime.

It is a super-2 number, since 2×161565393² = 52206752430488898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161565343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166596 + ... + 167562.

It is an arithmetic number, because the mean of its divisors is an integer number (7562016).

Almost surely, 2^161565393 is an apocalyptic number.

It is an amenable number.

161565393 is a deficient number, since it is larger than the sum of its proper divisors (80419119).

161565393 is a wasteful number, since it uses less digits than its factorization.

161565393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125.

The product of its digits is 72900, while the sum is 39.

The square root of 161565393 is about 12710.8376199210. The cubic root of 161565393 is about 544.6482515500.

The spelling of 161565393 in words is "one hundred sixty-one million, five hundred sixty-five thousand, three hundred ninety-three".