689431881 has 16 divisors (see below), whose sum is σ = 926069760. Its totient is φ = 456218880.

The previous prime is 689431879. The next prime is 689431901. The reversal of 689431881 is 188134986.

689431881 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 689431881 - 2¹ = 689431879 is a prime.

It is a super-2 number, since 2×689431881² = 950632637078396322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 689431881.

It is not an unprimeable number, because it can be changed into a prime (689433881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338775 + ... + 340803.

It is an arithmetic number, because the mean of its divisors is an integer number (57879360).

Almost surely, 2^689431881 is an apocalyptic number.

It is an amenable number.

689431881 is a deficient number, since it is larger than the sum of its proper divisors (236637879).

689431881 is a wasteful number, since it uses less digits than its factorization.

689431881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816.

The product of its digits is 331776, while the sum is 48.

The square root of 689431881 is about 26257.0348859120. The cubic root of 689431881 is about 883.4130031698.

The spelling of 689431881 in words is "six hundred eighty-nine million, four hundred thirty-one thousand, eight hundred eighty-one".