687515004131 has 2 divisors, whose sum is σ = 687515004132. Its totient is φ = 687515004130.

The previous prime is 687515004079. The next prime is 687515004181. The reversal of 687515004131 is 131400515786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687515004131 - 2¹⁰ = 687515003107 is a prime.

It is a super-2 number, since 2×687515004131² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (687515004181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343757502065 + 343757502066.

It is an arithmetic number, because the mean of its divisors is an integer number (343757502066).

Almost surely, 2^687515004131 is an apocalyptic number.

687515004131 is a deficient number, since it is larger than the sum of its proper divisors (1).

687515004131 is an equidigital number, since it uses as much as digits as its factorization.

687515004131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 687515004131 in words is "six hundred eighty-seven billion, five hundred fifteen million, four thousand, one hundred thirty-one".