161604215 has 16 divisors (see below), whose sum is σ = 204703200. Its totient is φ = 122136192.

The previous prime is 161604199. The next prime is 161604239. The reversal of 161604215 is 512406161.

It is a cyclic number.

It is not a de Polignac number, because 161604215 - 2⁴ = 161604199 is a prime.

It is a super-2 number, since 2×161604215² = 52231844611532450, which contains 22 as substring.

It is a congruent number.

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, 34769 + ... + 39141.

It is an arithmetic number, because the mean of its divisors is an integer number (12793950).

Almost surely, 2^161604215 is an apocalyptic number.

161604215 is a deficient number, since it is larger than the sum of its proper divisors (43098985).

161604215 is a wasteful number, since it uses less digits than its factorization.

161604215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4786.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 161604215 is about 12712.3646502136. The cubic root of 161604215 is about 544.6918719497.

The spelling of 161604215 in words is "one hundred sixty-one million, six hundred four thousand, two hundred fifteen".