681869259 has 10 divisors (see below), whose sum is σ = 1018594940. Its totient is φ = 454579452.

The previous prime is 681869239. The next prime is 681869267. The reversal of 681869259 is 952968186.

It is a happy number.

It is not a de Polignac number, because 681869259 - 2⁸ = 681869003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681869239) 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 9 ways as a sum of consecutive naturals, for example, 4208989 + ... + 4209150.

It is an arithmetic number, because the mean of its divisors is an integer number (101859494).

Almost surely, 2^681869259 is an apocalyptic number.

681869259 is a deficient number, since it is larger than the sum of its proper divisors (336725681).

681869259 is an equidigital number, since it uses as much as digits as its factorization.

681869259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8418151 (or 8418142 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 681869259 is about 26112.6264286073. The cubic root of 681869259 is about 880.1709632541.

The spelling of 681869259 in words is "six hundred eighty-one million, eight hundred sixty-nine thousand, two hundred fifty-nine".