689418689 has 2 divisors, whose sum is σ = 689418690. Its totient is φ = 689418688.

The previous prime is 689418659. The next prime is 689418713. The reversal of 689418689 is 986814986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504676225 + 184742464 = 22465^2 + 13592^2 .

It is a cyclic number.

It is not a de Polignac number, because 689418689 - 2¹⁶ = 689353153 is a prime.

It is not a weakly prime, because it can be changed into another prime (689418659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344709344 + 344709345.

It is an arithmetic number, because the mean of its divisors is an integer number (344709345).

Almost surely, 2^689418689 is an apocalyptic number.

It is an amenable number.

689418689 is a deficient number, since it is larger than the sum of its proper divisors (1).

689418689 is an equidigital number, since it uses as much as digits as its factorization.

689418689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5971968, while the sum is 59.

The square root of 689418689 is about 26256.7836758427. The cubic root of 689418689 is about 883.4073685504.

The spelling of 689418689 in words is "six hundred eighty-nine million, four hundred eighteen thousand, six hundred eighty-nine".