51503013 has 16 divisors (see below), whose sum is σ = 80789760. Its totient is φ = 32315328.

The previous prime is 51502999. The next prime is 51503083. The reversal of 51503013 is 31030515.

It is a happy number.

It is not a de Polignac number, because 51503013 - 2⁸ = 51502757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51503083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55645 + ... + 56562.

It is an arithmetic number, because the mean of its divisors is an integer number (5049360).

Almost surely, 2^51503013 is an apocalyptic number.

It is an amenable number.

51503013 is a deficient number, since it is larger than the sum of its proper divisors (29286747).

51503013 is a wasteful number, since it uses less digits than its factorization.

51503013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112233 (or 112227 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 18.

The square root of 51503013 is about 7176.5599697905. The cubic root of 51503013 is about 372.0581984908.

Adding to 51503013 its reverse (31030515), we get a palindrome (82533528).

The spelling of 51503013 in words is "fifty-one million, five hundred three thousand, thirteen".