51939585 has 24 divisors (see below), whose sum is σ = 90514944. Its totient is φ = 27551520.

The previous prime is 51939541. The next prime is 51939593. The reversal of 51939585 is 58593915.

It is not a de Polignac number, because 51939585 - 2⁷ = 51939457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51939585.

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, 5574 + ... + 11616.

It is an arithmetic number, because the mean of its divisors is an integer number (3771456).

Almost surely, 2^51939585 is an apocalyptic number.

It is an amenable number.

51939585 is a deficient number, since it is larger than the sum of its proper divisors (38575359).

51939585 is a wasteful number, since it uses less digits than its factorization.

51939585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6245 (or 6242 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

The square root of 51939585 is about 7206.9123069453. The cubic root of 51939585 is about 373.1065085994.

It can be divided in two parts, 519 and 39585, that added together give a palindrome (40104).

The spelling of 51939585 in words is "fifty-one million, nine hundred thirty-nine thousand, five hundred eighty-five".