51696931 has 12 divisors (see below), whose sum is σ = 61070760. Its totient is φ = 43380480.

The previous prime is 51696919. The next prime is 51696971. The reversal of 51696931 is 13969615.

It is not a de Polignac number, because 51696931 - 2¹³ = 51688739 is a prime.

It is a super-2 number, since 2×51696931² = 5345145349637522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51696901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12046 + ... + 15763.

It is an arithmetic number, because the mean of its divisors is an integer number (5089230).

Almost surely, 2^51696931 is an apocalyptic number.

51696931 is a deficient number, since it is larger than the sum of its proper divisors (9373829).

51696931 is a wasteful number, since it uses less digits than its factorization.

51696931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27846 (or 27833 counting only the distinct ones).

The product of its digits is 43740, while the sum is 40.

The square root of 51696931 is about 7190.0577883630. The cubic root of 51696931 is about 372.5245687442.

It can be divided in two parts, 5169 and 6931, that added together give a square (12100 = 110²).

The spelling of 51696931 in words is "fifty-one million, six hundred ninety-six thousand, nine hundred thirty-one".