51500231 has 4 divisors (see below), whose sum is σ = 51515112. Its totient is φ = 51485352.

The previous prime is 51500227. The next prime is 51500233. The reversal of 51500231 is 13200515.

51500231 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51500231 - 2² = 51500227 is a prime.

It is a super-2 number, since 2×51500231² = 5304547586106722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51500233) 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, 776 + ... + 10178.

It is an arithmetic number, because the mean of its divisors is an integer number (12878778).

Almost surely, 2^51500231 is an apocalyptic number.

51500231 is a deficient number, since it is larger than the sum of its proper divisors (14881).

51500231 is an equidigital number, since it uses as much as digits as its factorization.

51500231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14880.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 51500231 is about 7176.3661417182. The cubic root of 51500231 is about 372.0514993064.

Adding to 51500231 its reverse (13200515), we get a palindrome (64700746).

The spelling of 51500231 in words is "fifty-one million, five hundred thousand, two hundred thirty-one".