689849631 has 6 divisors (see below), whose sum is σ = 996449480. Its totient is φ = 459899748.

The previous prime is 689849617. The next prime is 689849639. The reversal of 689849631 is 136948986.

689849631 is a `hidden beast` number, since 68 + 98 + 496 + 3 + 1 = 666.

689849631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 689849631 - 2²⁹ = 152978719 is a prime.

It is a super-2 number, since 2×689849631² = 951785026781672322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689849639) 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, 38324971 + ... + 38324988.

Almost surely, 2^689849631 is an apocalyptic number.

689849631 is a deficient number, since it is larger than the sum of its proper divisors (306599849).

689849631 is a wasteful number, since it uses less digits than its factorization.

689849631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76649965 (or 76649962 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 689849631 is about 26264.9886921735. The cubic root of 689849631 is about 883.5913970417.

The spelling of 689849631 in words is "six hundred eighty-nine million, eight hundred forty-nine thousand, six hundred thirty-one".