691713077 has 12 divisors (see below), whose sum is σ = 761248908. Its totient is φ = 628056000.

The previous prime is 691713041. The next prime is 691713089. The reversal of 691713077 is 770317196.

691713077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 204804721 + 486908356 = 14311^2 + 22066^2 .

It is not a de Polignac number, because 691713077 - 2⁸ = 691712821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691713097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110327 + ... + 116427.

It is an arithmetic number, because the mean of its divisors is an integer number (63437409).

Almost surely, 2^691713077 is an apocalyptic number.

It is an amenable number.

691713077 is a deficient number, since it is larger than the sum of its proper divisors (69535831).

691713077 is a wasteful number, since it uses less digits than its factorization.

691713077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7060 (or 7049 counting only the distinct ones).

The product of its (nonzero) digits is 55566, while the sum is 41.

The square root of 691713077 is about 26300.4387225765. The cubic root of 691713077 is about 884.3862777670.

The spelling of 691713077 in words is "six hundred ninety-one million, seven hundred thirteen thousand, seventy-seven".