51315291 has 12 divisors (see below), whose sum is σ = 74299680. Its totient is φ = 34128240.

The previous prime is 51315283. The next prime is 51315301. The reversal of 51315291 is 19251315.

51315291 is a `hidden beast` number, since 5 + 131 + 529 + 1 = 666.

It is not a de Polignac number, because 51315291 - 2³ = 51315283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51315281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2736 + ... + 10493.

It is an arithmetic number, because the mean of its divisors is an integer number (6191640).

Almost surely, 2^51315291 is an apocalyptic number.

51315291 is a deficient number, since it is larger than the sum of its proper divisors (22984389).

51315291 is a wasteful number, since it uses less digits than its factorization.

51315291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13666 (or 13663 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 51315291 is about 7163.4692014414. The cubic root of 51315291 is about 371.6056130707.

The spelling of 51315291 in words is "fifty-one million, three hundred fifteen thousand, two hundred ninety-one".