689725231 has 16 divisors (see below), whose sum is σ = 779339008. Its totient is φ = 606009600.

The previous prime is 689725151. The next prime is 689725237. The reversal of 689725231 is 132527986.

It is a cyclic number.

It is not a de Polignac number, because 689725231 - 2¹¹ = 689723183 is a prime.

It is a super-2 number, since 2×689725231² = 951441788556006722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689725237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10555 + ... + 38611.

It is an arithmetic number, because the mean of its divisors is an integer number (48708688).

Almost surely, 2^689725231 is an apocalyptic number.

689725231 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

689725231 is a deficient number, since it is larger than the sum of its proper divisors (89613777).

689725231 is a wasteful number, since it uses less digits than its factorization.

689725231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28162.

The product of its digits is 181440, while the sum is 43.

The square root of 689725231 is about 26262.6204138125. The cubic root of 689725231 is about 883.5382814193.

The spelling of 689725231 in words is "six hundred eighty-nine million, seven hundred twenty-five thousand, two hundred thirty-one".