689285431 has 2 divisors, whose sum is σ = 689285432. Its totient is φ = 689285430.

The previous prime is 689285419. The next prime is 689285437. The reversal of 689285431 is 134582986.

689285431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689285431 - 2¹¹ = 689283383 is a prime.

It is a super-2 number, since 2×689285431² = 950228810777711522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689285437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344642715 + 344642716.

It is an arithmetic number, because the mean of its divisors is an integer number (344642716).

Almost surely, 2^689285431 is an apocalyptic number.

689285431 is a deficient number, since it is larger than the sum of its proper divisors (1).

689285431 is an equidigital number, since it uses as much as digits as its factorization.

689285431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 46.

The square root of 689285431 is about 26254.2459613678. The cubic root of 689285431 is about 883.3504468343.

The spelling of 689285431 in words is "six hundred eighty-nine million, two hundred eighty-five thousand, four hundred thirty-one".