681970289 has 24 divisors (see below), whose sum is σ = 932012928. Its totient is φ = 490523040.

The previous prime is 681970277. The next prime is 681970297. The reversal of 681970289 is 982079186.

It is not a de Polignac number, because 681970289 - 2²⁰ = 680921713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (681970229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41657 + ... + 55670.

It is an arithmetic number, because the mean of its divisors is an integer number (38833872).

Almost surely, 2^681970289 is an apocalyptic number.

It is an amenable number.

681970289 is a deficient number, since it is larger than the sum of its proper divisors (250042639).

681970289 is a wasteful number, since it uses less digits than its factorization.

681970289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97365 (or 97358 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 681970289 is about 26114.5608617108. The cubic root of 681970289 is about 880.2144316462.

The spelling of 681970289 in words is "six hundred eighty-one million, nine hundred seventy thousand, two hundred eighty-nine".