51604131 has 4 divisors (see below), whose sum is σ = 68805512. Its totient is φ = 34402752.

The previous prime is 51604127. The next prime is 51604183. The reversal of 51604131 is 13140615.

51604131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51604131 - 2² = 51604127 is a prime.

It is a super-2 number, since 2×51604131² = 5325972672530322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51604098 and 51604107.

It is not an unprimeable number, because it can be changed into a prime (51604121) 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 3 ways as a sum of consecutive naturals, for example, 8600686 + ... + 8600691.

It is an arithmetic number, because the mean of its divisors is an integer number (17201378).

Almost surely, 2^51604131 is an apocalyptic number.

51604131 is a deficient number, since it is larger than the sum of its proper divisors (17201381).

51604131 is a wasteful number, since it uses less digits than its factorization.

51604131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17201380.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 51604131 is about 7183.6015340496. The cubic root of 51604131 is about 372.3015317385.

Adding to 51604131 its reverse (13140615), we get a palindrome (64744746).

The spelling of 51604131 in words is "fifty-one million, six hundred four thousand, one hundred thirty-one".