51977531 has 2 divisors, whose sum is σ = 51977532. Its totient is φ = 51977530.

The previous prime is 51977501. The next prime is 51977557. The reversal of 51977531 is 13577915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51977531 - 2²² = 47783227 is a prime.

It is a super-2 number, since 2×51977531² = 5403327457711922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51977501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25988765 + 25988766.

It is an arithmetic number, because the mean of its divisors is an integer number (25988766).

Almost surely, 2^51977531 is an apocalyptic number.

51977531 is a deficient number, since it is larger than the sum of its proper divisors (1).

51977531 is an equidigital number, since it uses as much as digits as its factorization.

51977531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33075, while the sum is 38.

The square root of 51977531 is about 7209.5444377575. The cubic root of 51977531 is about 373.1973478128.

The spelling of 51977531 in words is "fifty-one million, nine hundred seventy-seven thousand, five hundred thirty-one".