51971831 has 2 divisors, whose sum is σ = 51971832. Its totient is φ = 51971830.

The previous prime is 51971813. The next prime is 51971851. The reversal of 51971831 is 13817915.

Together with previous prime (51971813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51971831 - 2⁶ = 51971767 is a prime.

It is a super-2 number, since 2×51971831² = 5402142434985122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51971791 and 51971800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51971851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25985915 + 25985916.

It is an arithmetic number, because the mean of its divisors is an integer number (25985916).

Almost surely, 2^51971831 is an apocalyptic number.

51971831 is a deficient number, since it is larger than the sum of its proper divisors (1).

51971831 is an equidigital number, since it uses as much as digits as its factorization.

51971831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 35.

The square root of 51971831 is about 7209.1491176144. The cubic root of 51971831 is about 373.1837053626.

The spelling of 51971831 in words is "fifty-one million, nine hundred seventy-one thousand, eight hundred thirty-one".