161204504 has 32 divisors (see below), whose sum is σ = 314161200. Its totient is φ = 77454720.

The previous prime is 161204473. The next prime is 161204507. The reversal of 161204504 is 405402161.

It is a self number, because there is not a number n which added to its sum of digits gives 161204504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161204507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51134 + ... + 54194.

Almost surely, 2^161204504 is an apocalyptic number.

It is an amenable number.

161204504 is a deficient number, since it is larger than the sum of its proper divisors (152956696).

161204504 is a wasteful number, since it uses less digits than its factorization.

161204504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323 (or 3319 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 161204504 is about 12696.6335695727. The cubic root of 161204504 is about 544.2424218703.

Adding to 161204504 its reverse (405402161), we get a palindrome (566606665).

The spelling of 161204504 in words is "one hundred sixty-one million, two hundred four thousand, five hundred four".