691980975 has 60 divisors (see below), whose sum is σ = 1464930544. Its totient is φ = 316327680.

The previous prime is 691980929. The next prime is 691981001. The reversal of 691980975 is 579089196.

It is not a de Polignac number, because 691980975 - 2⁷ = 691980847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 10234 + ... + 38583.

Almost surely, 2^691980975 is an apocalyptic number.

691980975 is an abundant number, since it is smaller than the sum of its proper divisors (772949569).

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

691980975 is a wasteful number, since it uses less digits than its factorization.

691980975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48846 (or 48832 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The square root of 691980975 is about 26305.5312624551. The cubic root of 691980975 is about 884.5004362443.

The spelling of 691980975 in words is "six hundred ninety-one million, nine hundred eighty thousand, nine hundred seventy-five".