51255931 has 2 divisors, whose sum is σ = 51255932. Its totient is φ = 51255930.

The previous prime is 51255913. The next prime is 51255943. The reversal of 51255931 is 13955215.

Together with previous prime (51255913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51255931 - 2⁵ = 51255899 is a prime.

It is a super-2 number, since 2×51255931² = 5254340925353522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51255893 and 51255902.

It is not a weakly prime, because it can be changed into another prime (51255961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25627965 + 25627966.

It is an arithmetic number, because the mean of its divisors is an integer number (25627966).

Almost surely, 2^51255931 is an apocalyptic number.

51255931 is a deficient number, since it is larger than the sum of its proper divisors (1).

51255931 is an equidigital number, since it uses as much as digits as its factorization.

51255931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6750, while the sum is 31.

The square root of 51255931 is about 7159.3247586626. The cubic root of 51255931 is about 371.4622703505.

The spelling of 51255931 in words is "fifty-one million, two hundred fifty-five thousand, nine hundred thirty-one".