51995131 has 2 divisors, whose sum is σ = 51995132. Its totient is φ = 51995130.

The previous prime is 51995123. The next prime is 51995143. The reversal of 51995131 is 13159915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51995131 - 2³ = 51995123 is a prime.

It is a super-2 number, since 2×51995131² = 5406987295414322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51995431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25997565 + 25997566.

It is an arithmetic number, because the mean of its divisors is an integer number (25997566).

Almost surely, 2^51995131 is an apocalyptic number.

51995131 is a deficient number, since it is larger than the sum of its proper divisors (1).

51995131 is an equidigital number, since it uses as much as digits as its factorization.

51995131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6075, while the sum is 34.

The square root of 51995131 is about 7210.7649386178. The cubic root of 51995131 is about 373.2394655765.

The spelling of 51995131 in words is "fifty-one million, nine hundred ninety-five thousand, one hundred thirty-one".