51215013 has 24 divisors (see below), whose sum is σ = 79354080. Its totient is φ = 31730400.

The previous prime is 51214991. The next prime is 51215029. The reversal of 51215013 is 31051215.

51215013 is a `hidden beast` number, since 512 + 150 + 1 + 3 = 666.

It is not a de Polignac number, because 51215013 - 2⁵ = 51214981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51215053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6238 + ... + 11888.

It is an arithmetic number, because the mean of its divisors is an integer number (3306420).

Almost surely, 2^51215013 is an apocalyptic number.

51215013 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

It is an amenable number.

51215013 is a deficient number, since it is larger than the sum of its proper divisors (28139067).

51215013 is a wasteful number, since it uses less digits than its factorization.

51215013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5729 (or 5726 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 51215013 is about 7156.4665163752. The cubic root of 51215013 is about 371.3633969824.

Adding to 51215013 its reverse (31051215), we get a palindrome (82266228).

The spelling of 51215013 in words is "fifty-one million, two hundred fifteen thousand, thirteen".