51515731411387 has 2 divisors, whose sum is σ = 51515731411388. Its totient is φ = 51515731411386.

The previous prime is 51515731411373. The next prime is 51515731411457. The reversal of 51515731411387 is 78311413751515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51515731411387 - 2³¹ = 51513583927739 is a prime.

It is not a weakly prime, because it can be changed into another prime (51515731417387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25757865705693 + 25757865705694.

It is an arithmetic number, because the mean of its divisors is an integer number (25757865705694).

Almost surely, 2^{51515731411387} is an apocalyptic number.

51515731411387 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515731411387 is an equidigital number, since it uses as much as digits as its factorization.

51515731411387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764000, while the sum is 52.

The spelling of 51515731411387 in words is "fifty-one trillion, five hundred fifteen billion, seven hundred thirty-one million, four hundred eleven thousand, three hundred eighty-seven".