681872289 has 12 divisors (see below), whose sum is σ = 1057598064. Its totient is φ = 389641224.

The previous prime is 681872203. The next prime is 681872299. The reversal of 681872289 is 982278186.

It is a happy number.

It is not a de Polignac number, because 681872289 - 2¹³ = 681864097 is a prime.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (681872299) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2319147 + ... + 2319440.

It is an arithmetic number, because the mean of its divisors is an integer number (88133172).

Almost surely, 2^681872289 is an apocalyptic number.

It is an amenable number.

681872289 is a deficient number, since it is larger than the sum of its proper divisors (375725775).

681872289 is a wasteful number, since it uses less digits than its factorization.

681872289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4638604 (or 4638597 counting only the distinct ones).

The product of its digits is 774144, while the sum is 51.

The square root of 681872289 is about 26112.6844464525. The cubic root of 681872289 is about 880.1722669811.

The spelling of 681872289 in words is "six hundred eighty-one million, eight hundred seventy-two thousand, two hundred eighty-nine".