331228691 has 18 divisors (see below), whose sum is σ = 362381292. Its totient is φ = 302697360.

The previous prime is 331228679. The next prime is 331228763. The reversal of 331228691 is 196822133.

It is not a de Polignac number, because 331228691 - 2¹⁸ = 330966547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331228621) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 303056 + ... + 304146.

It is an arithmetic number, because the mean of its divisors is an integer number (20132294).

Almost surely, 2^331228691 is an apocalyptic number.

331228691 is a deficient number, since it is larger than the sum of its proper divisors (31152601).

331228691 is a wasteful number, since it uses less digits than its factorization.

331228691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187 (or 1139 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 331228691 is about 18199.6893105349. The cubic root of 331228691 is about 691.8989147844.

The spelling of 331228691 in words is "three hundred thirty-one million, two hundred twenty-eight thousand, six hundred ninety-one".