331786889 has 6 divisors (see below), whose sum is σ = 385956234. Its totient is φ = 284388720.

The previous prime is 331786859. The next prime is 331786901. The reversal of 331786889 is 988687133.

It can be written as a sum of positive squares in only one way, i.e., 207129664 + 124657225 = 14392^2 + 11165^2 .

It is not a de Polignac number, because 331786889 - 2⁸ = 331786633 is a prime.

It is a super-2 number, since 2×331786889² = 220165079424596642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 331786889.

It is not an unprimeable number, because it can be changed into a prime (331786849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3385532 + ... + 3385629.

It is an arithmetic number, because the mean of its divisors is an integer number (64326039).

Almost surely, 2^331786889 is an apocalyptic number.

It is an amenable number.

331786889 is a deficient number, since it is larger than the sum of its proper divisors (54169345).

331786889 is an equidigital number, since it uses as much as digits as its factorization.

331786889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6771175 (or 6771168 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 53.

The square root of 331786889 is about 18215.0182267271. The cubic root of 331786889 is about 692.2873672833.

The spelling of 331786889 in words is "three hundred thirty-one million, seven hundred eighty-six thousand, eight hundred eighty-nine".