51685534 has 16 divisors (see below), whose sum is σ = 79315200. Its totient is φ = 25252504.

The previous prime is 51685523. The next prime is 51685561. The reversal of 51685534 is 43558615.

It is a junction number, because it is equal to n+sod(n) for n = 51685493 and 51685502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19899 + ... + 22345.

It is an arithmetic number, because the mean of its divisors is an integer number (4957200).

Almost surely, 2^51685534 is an apocalyptic number.

51685534 is a deficient number, since it is larger than the sum of its proper divisors (27629666).

51685534 is a wasteful number, since it uses less digits than its factorization.

51685534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687.

The product of its digits is 72000, while the sum is 37.

The square root of 51685534 is about 7189.2651919372. The cubic root of 51685534 is about 372.4971913966.

The spelling of 51685534 in words is "fifty-one million, six hundred eighty-five thousand, five hundred thirty-four".