51315705 has 24 divisors (see below), whose sum is σ = 101654592. Its totient is φ = 23458464.

The previous prime is 51315683. The next prime is 51315721. The reversal of 51315705 is 50751315.

It is not a de Polignac number, because 51315705 - 2⁸ = 51315449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81139 + ... + 81768.

It is an arithmetic number, because the mean of its divisors is an integer number (4235608).

Almost surely, 2^51315705 is an apocalyptic number.

It is an amenable number.

51315705 is a deficient number, since it is larger than the sum of its proper divisors (50338887).

51315705 is a wasteful number, since it uses less digits than its factorization.

51315705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162925 (or 162922 counting only the distinct ones).

The product of its (nonzero) digits is 2625, while the sum is 27.

The square root of 51315705 is about 7163.4980979965. The cubic root of 51315705 is about 371.6066124110.

The spelling of 51315705 in words is "fifty-one million, three hundred fifteen thousand, seven hundred five".