689389261 has 4 divisors (see below), whose sum is σ = 752061024. Its totient is φ = 626717500.

The previous prime is 689389249. The next prime is 689389271. The reversal of 689389261 is 162983986.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689389261 is a prime.

It is a super-2 number, since 2×689389261² = 950515106364252242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 689389199 and 689389208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689389231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31335865 + ... + 31335886.

It is an arithmetic number, because the mean of its divisors is an integer number (188015256).

Almost surely, 2^689389261 is an apocalyptic number.

It is an amenable number.

689389261 is a deficient number, since it is larger than the sum of its proper divisors (62671763).

689389261 is a wasteful number, since it uses less digits than its factorization.

689389261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62671762.

The product of its digits is 1119744, while the sum is 52.

The square root of 689389261 is about 26256.2232813480. The cubic root of 689389261 is about 883.3947988873.

The spelling of 689389261 in words is "six hundred eighty-nine million, three hundred eighty-nine thousand, two hundred sixty-one".