691677 has 12 divisors (see below), whose sum is σ = 1141920. Its totient is φ = 395208.

The previous prime is 691661. The next prime is 691681. The reversal of 691677 is 776196.

It is not a de Polignac number, because 691677 - 2⁴ = 691661 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

691677 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691677.

It is not an unprimeable number, because it can be changed into a prime (691637) 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, 5427 + ... + 5552.

It is an arithmetic number, because the mean of its divisors is an integer number (95160).

2⁶⁹¹⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

691677 is a deficient number, since it is larger than the sum of its proper divisors (450243).

691677 is a wasteful number, since it uses less digits than its factorization.

691677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10992 (or 10989 counting only the distinct ones).

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

The square root of 691677 is about 831.6712090724. The cubic root of 691677 is about 88.4370902144.

The spelling of 691677 in words is "six hundred ninety-one thousand, six hundred seventy-seven".