51716531 has 2 divisors, whose sum is σ = 51716532. Its totient is φ = 51716530.

The previous prime is 51716527. The next prime is 51716543. The reversal of 51716531 is 13561715.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51716531 - 2² = 51716527 is a prime.

It is a super-2 number, since 2×51716531² = 5349199157347922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 51716494 and 51716503.

It is not a weakly prime, because it can be changed into another prime (51710531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25858265 + 25858266.

It is an arithmetic number, because the mean of its divisors is an integer number (25858266).

Almost surely, 2^51716531 is an apocalyptic number.

51716531 is a deficient number, since it is larger than the sum of its proper divisors (1).

51716531 is an equidigital number, since it uses as much as digits as its factorization.

51716531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3150, while the sum is 29.

The square root of 51716531 is about 7191.4206524163. The cubic root of 51716531 is about 372.5716415514.

The spelling of 51716531 in words is "fifty-one million, seven hundred sixteen thousand, five hundred thirty-one".