51689807 has 8 divisors (see below), whose sum is σ = 57024240. Its totient is φ = 46549440.

The previous prime is 51689773. The next prime is 51689821. The reversal of 51689807 is 70898615.

It is a happy number.

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 51689807 - 2⁸ = 51689551 is a prime.

It is a super-2 number, since 2×51689807² = 5343672295394498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51689857) 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, 47957 + ... + 49022.

It is an arithmetic number, because the mean of its divisors is an integer number (7128030).

Almost surely, 2^51689807 is an apocalyptic number.

51689807 is a deficient number, since it is larger than the sum of its proper divisors (5334433).

51689807 is a wasteful number, since it uses less digits than its factorization.

51689807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97033.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 51689807 is about 7189.5623649844. The cubic root of 51689807 is about 372.5074562716.

The spelling of 51689807 in words is "fifty-one million, six hundred eighty-nine thousand, eight hundred seven".