689261909 has 8 divisors (see below), whose sum is σ = 804488448. Its totient is φ = 578225520.

The previous prime is 689261887. The next prime is 689261927. The reversal of 689261909 is 909162986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 689261909 - 2⁸ = 689261653 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 (689261959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1047182 + ... + 1047839.

It is an arithmetic number, because the mean of its divisors is an integer number (100561056).

Almost surely, 2^689261909 is an apocalyptic number.

It is an amenable number.

689261909 is a deficient number, since it is larger than the sum of its proper divisors (115226539).

689261909 is a wasteful number, since it uses less digits than its factorization.

689261909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095075.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 689261909 is about 26253.7979919097. The cubic root of 689261909 is about 883.3403985511.

The spelling of 689261909 in words is "six hundred eighty-nine million, two hundred sixty-one thousand, nine hundred nine".