689165391 has 4 divisors (see below), whose sum is σ = 918887192. Its totient is φ = 459443592.

The previous prime is 689165383. The next prime is 689165423. The reversal of 689165391 is 193561986.

689165391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 689165391 - 2³ = 689165383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 689165391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689165311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114860896 + ... + 114860901.

It is an arithmetic number, because the mean of its divisors is an integer number (229721798).

Almost surely, 2^689165391 is an apocalyptic number.

689165391 is a deficient number, since it is larger than the sum of its proper divisors (229721801).

689165391 is a wasteful number, since it uses less digits than its factorization.

689165391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229721800.

The product of its digits is 349920, while the sum is 48.

The square root of 689165391 is about 26251.9597554164. The cubic root of 689165391 is about 883.2991649613.

The spelling of 689165391 in words is "six hundred eighty-nine million, one hundred sixty-five thousand, three hundred ninety-one".