691049613 has 32 divisors (see below), whose sum is σ = 988738560. Its totient is φ = 428359680.

The previous prime is 691049599. The next prime is 691049659. The reversal of 691049613 is 316940196.

It is not a de Polignac number, because 691049613 - 2⁸ = 691049357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691049683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 692631 + ... + 693627.

It is an arithmetic number, because the mean of its divisors is an integer number (30898080).

Almost surely, 2^691049613 is an apocalyptic number.

It is an amenable number.

691049613 is a deficient number, since it is larger than the sum of its proper divisors (297688947).

691049613 is a wasteful number, since it uses less digits than its factorization.

691049613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 691049613 is about 26287.8225229858. The cubic root of 691049613 is about 884.1034311285.

The spelling of 691049613 in words is "six hundred ninety-one million, forty-nine thousand, six hundred thirteen".