51504231 has 16 divisors (see below), whose sum is σ = 72515840. Its totient is φ = 32515992.

The previous prime is 51504221. The next prime is 51504247. The reversal of 51504231 is 13240515.

51504231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-51504231 is a prime.

It is a super-2 number, since 2×51504231² = 5305371621802722, 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 = 51504198 and 51504207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51504221) 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 15 ways as a sum of consecutive naturals, for example, 19326 + ... + 21828.

It is an arithmetic number, because the mean of its divisors is an integer number (4532240).

Almost surely, 2^51504231 is an apocalyptic number.

51504231 is a deficient number, since it is larger than the sum of its proper divisors (21011609).

51504231 is an equidigital number, since it uses as much as digits as its factorization.

51504231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563 (or 2525 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51504231 is about 7176.6448288877. The cubic root of 51504231 is about 372.0611314151.

Adding to 51504231 its reverse (13240515), we get a palindrome (64744746).

The spelling of 51504231 in words is "fifty-one million, five hundred four thousand, two hundred thirty-one".