51531992 has 8 divisors (see below), whose sum is σ = 96622500. Its totient is φ = 25765992.

The previous prime is 51531989. The next prime is 51532001. The reversal of 51531992 is 29913515.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220742 + ... + 3220757.

Almost surely, 2^51531992 is an apocalyptic number.

It is an amenable number.

51531992 is a deficient number, since it is larger than the sum of its proper divisors (45090508).

51531992 is a wasteful number, since it uses less digits than its factorization.

51531992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6441505 (or 6441501 counting only the distinct ones).

The product of its digits is 12150, while the sum is 35.

The square root of 51531992 is about 7178.5786894064. The cubic root of 51531992 is about 372.1279669201.

The spelling of 51531992 in words is "fifty-one million, five hundred thirty-one thousand, nine hundred ninety-two".