691313956 has 24 divisors (see below), whose sum is σ = 1252111896. Its totient is φ = 333742080.

The previous prime is 691313941. The next prime is 691313963. The reversal of 691313956 is 659313196.

It can be written as a sum of positive squares in 4 ways, for example, as 11669056 + 679644900 = 3416^2 + 26070^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5821 + ... + 37636.

It is an arithmetic number, because the mean of its divisors is an integer number (52171329).

Almost surely, 2^691313956 is an apocalyptic number.

It is an amenable number.

691313956 is a deficient number, since it is larger than the sum of its proper divisors (560797940).

691313956 is a wasteful number, since it uses less digits than its factorization.

691313956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43599 (or 43597 counting only the distinct ones).

The product of its digits is 131220, while the sum is 43.

The square root of 691313956 is about 26292.8499025876. The cubic root of 691313956 is about 884.2161469913.

The spelling of 691313956 in words is "six hundred ninety-one million, three hundred thirteen thousand, nine hundred fifty-six".