689125081 has 4 divisors (see below), whose sum is σ = 692215552. Its totient is φ = 686034612.

The previous prime is 689125069. The next prime is 689125091. The reversal of 689125081 is 180521986.

689125081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 689125081 - 2²⁵ = 655570649 is a prime.

It is a super-2 number, since 2×689125081² = 949786754526513122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689125001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1544901 + ... + 1545346.

It is an arithmetic number, because the mean of its divisors is an integer number (173053888).

Almost surely, 2^689125081 is an apocalyptic number.

It is an amenable number.

689125081 is a deficient number, since it is larger than the sum of its proper divisors (3090471).

689125081 is a wasteful number, since it uses less digits than its factorization.

689125081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3090470.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 689125081 is about 26251.1919919839. The cubic root of 689125081 is about 883.2819429301.

The spelling of 689125081 in words is "six hundred eighty-nine million, one hundred twenty-five thousand, eighty-one".