51718775 has 6 divisors (see below), whose sum is σ = 64131312. Its totient is φ = 41375000.

The previous prime is 51718769. The next prime is 51718781. The reversal of 51718775 is 57781715.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51718769) and next prime (51718781).

It is not a de Polignac number, because 51718775 - 2⁸ = 51718519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1034351 + ... + 1034400.

It is an arithmetic number, because the mean of its divisors is an integer number (10688552).

Almost surely, 2^51718775 is an apocalyptic number.

51718775 is a deficient number, since it is larger than the sum of its proper divisors (12412537).

51718775 is a wasteful number, since it uses less digits than its factorization.

51718775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068761 (or 2068756 counting only the distinct ones).

The product of its digits is 68600, while the sum is 41.

The square root of 51718775 is about 7191.5766699661. The cubic root of 51718775 is about 372.5770301487.

The spelling of 51718775 in words is "fifty-one million, seven hundred eighteen thousand, seven hundred seventy-five".