161313636 has 48 divisors (see below), whose sum is σ = 421727040. Its totient is φ = 47560320.

The previous prime is 161313617. The next prime is 161313641. The reversal of 161313636 is 636313161.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11631 + ... + 21398.

It is an arithmetic number, because the mean of its divisors is an integer number (8785980).

Almost surely, 2^161313636 is an apocalyptic number.

It is an amenable number.

161313636 is an abundant number, since it is smaller than the sum of its proper divisors (260413404).

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

161313636 is a wasteful number, since it uses less digits than its factorization.

161313636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33084 (or 33082 counting only the distinct ones).

The product of its digits is 5832, while the sum is 30.

The square root of 161313636 is about 12700.9305170920. The cubic root of 161313636 is about 544.3652076582.

Adding to 161313636 its reverse (636313161), we get a palindrome (797626797).

The spelling of 161313636 in words is "one hundred sixty-one million, three hundred thirteen thousand, six hundred thirty-six".