51718791 has 8 divisors (see below), whose sum is σ = 69072624. Its totient is φ = 34422080.

The previous prime is 51718787. The next prime is 51718813. The reversal of 51718791 is 19781715.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51718791 - 2² = 51718787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51718721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12120 + ... + 15821.

It is an arithmetic number, because the mean of its divisors is an integer number (8634078).

Almost surely, 2^51718791 is an apocalyptic number.

51718791 is a deficient number, since it is larger than the sum of its proper divisors (17353833).

51718791 is a wasteful number, since it uses less digits than its factorization.

51718791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28561.

The product of its digits is 17640, while the sum is 39.

The square root of 51718791 is about 7191.5777823785. The cubic root of 51718791 is about 372.5770685695.

The spelling of 51718791 in words is "fifty-one million, seven hundred eighteen thousand, seven hundred ninety-one".