51131582813 has 2 divisors, whose sum is σ = 51131582814. Its totient is φ = 51131582812.

The previous prime is 51131582797. The next prime is 51131582837. The reversal of 51131582813 is 31828513115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31324398169 + 19807184644 = 176987^2 + 140738^2 .

It is a cyclic number.

It is not a de Polignac number, because 51131582813 - 2⁴ = 51131582797 is a prime.

It is a super-2 number, since 2×51131582813² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51133582813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25565791406 + 25565791407.

It is an arithmetic number, because the mean of its divisors is an integer number (25565791407).

Almost surely, 2^51131582813 is an apocalyptic number.

It is an amenable number.

51131582813 is a deficient number, since it is larger than the sum of its proper divisors (1).

51131582813 is an equidigital number, since it uses as much as digits as its factorization.

51131582813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 38.

The spelling of 51131582813 in words is "fifty-one billion, one hundred thirty-one million, five hundred eighty-two thousand, eight hundred thirteen".