688811315531 has 2 divisors, whose sum is σ = 688811315532. Its totient is φ = 688811315530.

The previous prime is 688811315471. The next prime is 688811315557. The reversal of 688811315531 is 135513118886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688811315531 - 2³⁰ = 687737573707 is a prime.

It is a super-2 number, since 2×688811315531² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 688811315531.

It is not a weakly prime, because it can be changed into another prime (688811315581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344405657765 + 344405657766.

It is an arithmetic number, because the mean of its divisors is an integer number (344405657766).

Almost surely, 2^688811315531 is an apocalyptic number.

688811315531 is a deficient number, since it is larger than the sum of its proper divisors (1).

688811315531 is an equidigital number, since it uses as much as digits as its factorization.

688811315531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 50.

The spelling of 688811315531 in words is "six hundred eighty-eight billion, eight hundred eleven million, three hundred fifteen thousand, five hundred thirty-one".