51697924 has 12 divisors (see below), whose sum is σ = 92005200. Its totient is φ = 25410728.

The previous prime is 51697907. The next prime is 51697931. The reversal of 51697924 is 42979615.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109294 + ... + 109765.

It is an arithmetic number, because the mean of its divisors is an integer number (7667100).

Almost surely, 2^51697924 is an apocalyptic number.

It is an amenable number.

51697924 is a deficient number, since it is larger than the sum of its proper divisors (40307276).

51697924 is a wasteful number, since it uses less digits than its factorization.

51697924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219122 (or 219120 counting only the distinct ones).

The product of its digits is 136080, while the sum is 43.

The square root of 51697924 is about 7190.1268417184. The cubic root of 51697924 is about 372.5269538924.

The spelling of 51697924 in words is "fifty-one million, six hundred ninety-seven thousand, nine hundred twenty-four".