51731685 has 12 divisors (see below), whose sum is σ = 89668332. Its totient is φ = 27590208.

The previous prime is 51731633. The next prime is 51731707. The reversal of 51731685 is 58613715.

It can be written as a sum of positive squares in 2 ways, for example, as 27436644 + 24295041 = 5238^2 + 4929^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51731685 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 574752 + ... + 574841.

It is an arithmetic number, because the mean of its divisors is an integer number (7472361).

Almost surely, 2^51731685 is an apocalyptic number.

It is an amenable number.

51731685 is a deficient number, since it is larger than the sum of its proper divisors (37936647).

51731685 is a wasteful number, since it uses less digits than its factorization.

51731685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149604 (or 1149601 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 51731685 is about 7192.4741918202. The cubic root of 51731685 is about 372.6080283648.

The spelling of 51731685 in words is "fifty-one million, seven hundred thirty-one thousand, six hundred eighty-five".