691064613 has 6 divisors (see below), whose sum is σ = 998204454. Its totient is φ = 460709736.

The previous prime is 691064609. The next prime is 691064629. The reversal of 691064613 is 316460196.

691064613 is a `hidden beast` number, since 6 + 9 + 1 + 0 + 646 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 575136324 + 115928289 = 23982^2 + 10767^2 .

It is not a de Polignac number, because 691064613 - 2² = 691064609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691064683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38392470 + ... + 38392487.

It is an arithmetic number, because the mean of its divisors is an integer number (166367409).

Almost surely, 2^691064613 is an apocalyptic number.

It is an amenable number.

691064613 is a deficient number, since it is larger than the sum of its proper divisors (307139841).

691064613 is a wasteful number, since it uses less digits than its factorization.

691064613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76784963 (or 76784960 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 691064613 is about 26288.1078246419. The cubic root of 691064613 is about 884.1098278981.

The spelling of 691064613 in words is "six hundred ninety-one million, sixty-four thousand, six hundred thirteen".