689877613 has 2 divisors, whose sum is σ = 689877614. Its totient is φ = 689877612.

The previous prime is 689877577. The next prime is 689877637. The reversal of 689877613 is 316778986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687855529 + 2022084 = 26227^2 + 1422^2 .

It is a cyclic number.

It is not a de Polignac number, because 689877613 - 2⁹ = 689877101 is a prime.

It is a super-2 number, since 2×689877613² = 951862241837155538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689877113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344938806 + 344938807.

It is an arithmetic number, because the mean of its divisors is an integer number (344938807).

Almost surely, 2^689877613 is an apocalyptic number.

It is an amenable number.

689877613 is a deficient number, since it is larger than the sum of its proper divisors (1).

689877613 is an equidigital number, since it uses as much as digits as its factorization.

689877613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 55.

The square root of 689877613 is about 26265.5213730853. The cubic root of 689877613 is about 883.6033437613.

The spelling of 689877613 in words is "six hundred eighty-nine million, eight hundred seventy-seven thousand, six hundred thirteen".