161315604 has 24 divisors (see below), whose sum is σ = 418225920. Its totient is φ = 53771832.

The previous prime is 161315593. The next prime is 161315633. The reversal of 161315604 is 406513161.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 746724 + ... + 746939.

It is an arithmetic number, because the mean of its divisors is an integer number (17426080).

Almost surely, 2^161315604 is an apocalyptic number.

It is an amenable number.

161315604 is an abundant number, since it is smaller than the sum of its proper divisors (256910316).

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

161315604 is a wasteful number, since it uses less digits than its factorization.

161315604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493676 (or 1493668 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 161315604 is about 12701.0079914942. The cubic root of 161315604 is about 544.3674213714.

Adding to 161315604 its reverse (406513161), we get a palindrome (567828765).

The spelling of 161315604 in words is "one hundred sixty-one million, three hundred fifteen thousand, six hundred four".