688361031089 has 2 divisors, whose sum is σ = 688361031090. Its totient is φ = 688361031088.

The previous prime is 688361031077. The next prime is 688361031151. The reversal of 688361031089 is 980130163886.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388951795600 + 299409235489 = 623660^2 + 547183^2 .

It is a cyclic number.

It is not a de Polignac number, because 688361031089 - 2²⁴ = 688344253873 is a prime.

It is a super-2 number, since 2×688361031089² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 688361031089.

It is not a weakly prime, because it can be changed into another prime (688361031389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344180515544 + 344180515545.

It is an arithmetic number, because the mean of its divisors is an integer number (344180515545).

Almost surely, 2^688361031089 is an apocalyptic number.

It is an amenable number.

688361031089 is a deficient number, since it is larger than the sum of its proper divisors (1).

688361031089 is an equidigital number, since it uses as much as digits as its factorization.

688361031089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The spelling of 688361031089 in words is "six hundred eighty-eight billion, three hundred sixty-one million, thirty-one thousand, eighty-nine".