691981060 has 12 divisors (see below), whose sum is σ = 1453160268. Its totient is φ = 276792416.

The previous prime is 691981057. The next prime is 691981061. The reversal of 691981060 is 60189196.

It can be written as a sum of positive squares in 2 ways, for example, as 406506244 + 285474816 = 20162^2 + 16896^2 .

It is not an unprimeable number, because it can be changed into a prime (691981061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17299507 + ... + 17299546.

It is an arithmetic number, because the mean of its divisors is an integer number (121096689).

Almost surely, 2^691981060 is an apocalyptic number.

It is an amenable number.

691981060 is an abundant number, since it is smaller than the sum of its proper divisors (761179208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691981060 is a wasteful number, since it uses less digits than its factorization.

691981060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34599062 (or 34599060 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 691981060 is about 26305.5328780848. The cubic root of 691981060 is about 884.5004724604.

The spelling of 691981060 in words is "six hundred ninety-one million, nine hundred eighty-one thousand, sixty".