691656086 has 24 divisors (see below), whose sum is σ = 1142368920. Its totient is φ = 313839680.

The previous prime is 691656071. The next prime is 691656103. The reversal of 691656086 is 680656196.

It is a self number, because there is not a number n which added to its sum of digits gives 691656086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157310 + ... + 161646.

It is an arithmetic number, because the mean of its divisors is an integer number (47598705).

Almost surely, 2^691656086 is an apocalyptic number.

691656086 is a deficient number, since it is larger than the sum of its proper divisors (450712834).

691656086 is a wasteful number, since it uses less digits than its factorization.

691656086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5020 (or 5009 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 691656086 is about 26299.3552392449. The cubic root of 691656086 is about 884.3619885811.

The spelling of 691656086 in words is "six hundred ninety-one million, six hundred fifty-six thousand, eighty-six".