51523931 has 2 divisors, whose sum is σ = 51523932. Its totient is φ = 51523930.

The previous prime is 51523903. The next prime is 51523937. The reversal of 51523931 is 13932515.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51523931 is a prime.

It is a super-2 number, since 2×51523931² = 5309430931385522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51523894 and 51523903.

It is not a weakly prime, because it can be changed into another prime (51523937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25761965 + 25761966.

It is an arithmetic number, because the mean of its divisors is an integer number (25761966).

Almost surely, 2^51523931 is an apocalyptic number.

51523931 is a deficient number, since it is larger than the sum of its proper divisors (1).

51523931 is an equidigital number, since it uses as much as digits as its factorization.

51523931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4050, while the sum is 29.

The square root of 51523931 is about 7178.0172053291. The cubic root of 51523931 is about 372.1085622755.

The spelling of 51523931 in words is "fifty-one million, five hundred twenty-three thousand, nine hundred thirty-one".