691313513 has 24 divisors (see below), whose sum is σ = 802327680. Its totient is φ = 590022720.

The previous prime is 691313489. The next prime is 691313533. The reversal of 691313513 is 315313196.

691313513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-691313513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 691313513.

It is not an unprimeable number, because it can be changed into a prime (691313533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 435920 + ... + 437502.

It is an arithmetic number, because the mean of its divisors is an integer number (33430320).

Almost surely, 2^691313513 is an apocalyptic number.

It is an amenable number.

691313513 is a deficient number, since it is larger than the sum of its proper divisors (111014167).

691313513 is a wasteful number, since it uses less digits than its factorization.

691313513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697 (or 1660 counting only the distinct ones).

The product of its digits is 7290, while the sum is 32.

The square root of 691313513 is about 26292.8414782427. The cubic root of 691313513 is about 884.2159581201.

The spelling of 691313513 in words is "six hundred ninety-one million, three hundred thirteen thousand, five hundred thirteen".