691357892 has 12 divisors (see below), whose sum is σ = 1213248960. Its totient is φ = 344715336.

The previous prime is 691357889. The next prime is 691357967. The reversal of 691357892 is 298753196.

It is a self number, because there is not a number n which added to its sum of digits gives 691357892.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239288 + ... + 242159.

It is an arithmetic number, because the mean of its divisors is an integer number (101104080).

Almost surely, 2^691357892 is an apocalyptic number.

It is an amenable number.

691357892 is a deficient number, since it is larger than the sum of its proper divisors (521891068).

691357892 is a wasteful number, since it uses less digits than its factorization.

691357892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481810 (or 481808 counting only the distinct ones).

The product of its digits is 816480, while the sum is 50.

The square root of 691357892 is about 26293.6854016321. The cubic root of 691357892 is about 884.2348785181.

The spelling of 691357892 in words is "six hundred ninety-one million, three hundred fifty-seven thousand, eight hundred ninety-two".