691713027 has 20 divisors (see below), whose sum is σ = 1047861936. Its totient is φ = 454643280.

The previous prime is 691713023. The next prime is 691713041. The reversal of 691713027 is 720317196.

It is a happy number.

It is not a de Polignac number, because 691713027 - 2² = 691713023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691712982 and 691713000.

It is not an unprimeable number, because it can be changed into a prime (691713023) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 54388 + ... + 65889.

Almost surely, 2^691713027 is an apocalyptic number.

691713027 is a deficient number, since it is larger than the sum of its proper divisors (356148909).

691713027 is a wasteful number, since it uses less digits than its factorization.

691713027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120360 (or 120351 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 691713027 is about 26300.4377720220. The cubic root of 691713027 is about 884.3862564579.

The spelling of 691713027 in words is "six hundred ninety-one million, seven hundred thirteen thousand, twenty-seven".