690815598131 has 6 divisors (see below), whose sum is σ = 702326100996. Its totient is φ = 679490748600.

The previous prime is 690815598113. The next prime is 690815598139. The reversal of 690815598131 is 131895518096.

It is a de Polignac number, because none of the positive numbers 2^k-690815598131 is a prime.

It is a super-2 number, since 2×690815598131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690815598139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92822885 + ... + 92830326.

It is an arithmetic number, because the mean of its divisors is an integer number (117054350166).

Almost surely, 2^690815598131 is an apocalyptic number.

690815598131 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

690815598131 is a deficient number, since it is larger than the sum of its proper divisors (11510502865).

690815598131 is an equidigital number, since it uses as much as digits as its factorization.

690815598131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185653333 (or 185653272 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 56.

The spelling of 690815598131 in words is "six hundred ninety billion, eight hundred fifteen million, five hundred ninety-eight thousand, one hundred thirty-one".