689256613 has 4 divisors (see below), whose sum is σ = 689561068. Its totient is φ = 688952160.

The previous prime is 689256577. The next prime is 689256637. The reversal of 689256613 is 316652986.

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

It can be written as a sum of positive squares in 2 ways, for example, as 171557604 + 517699009 = 13098^2 + 22753^2 .

It is a cyclic number.

It is not a de Polignac number, because 689256613 - 2²¹ = 687159461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689256643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148806 + ... + 153367.

It is an arithmetic number, because the mean of its divisors is an integer number (172390267).

Almost surely, 2^689256613 is an apocalyptic number.

It is an amenable number.

689256613 is a deficient number, since it is larger than the sum of its proper divisors (304455).

689256613 is a wasteful number, since it uses less digits than its factorization.

689256613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304454.

The product of its digits is 466560, while the sum is 46.

The square root of 689256613 is about 26253.6971301186. The cubic root of 689256613 is about 883.3381361394.

The spelling of 689256613 in words is "six hundred eighty-nine million, two hundred fifty-six thousand, six hundred thirteen".