331231402 has 16 divisors (see below), whose sum is σ = 500228352. Its totient is φ = 164492640.

The previous prime is 331231393. The next prime is 331231421. The reversal of 331231402 is 204132133.

It is a self number, because there is not a number n which added to its sum of digits gives 331231402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282277 + ... + 283447.

It is an arithmetic number, because the mean of its divisors is an integer number (31264272).

Almost surely, 2^331231402 is an apocalyptic number.

331231402 is a deficient number, since it is larger than the sum of its proper divisors (168996950).

331231402 is a wasteful number, since it uses less digits than its factorization.

331231402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 331231402 is about 18199.7637896760. The cubic root of 331231402 is about 691.9008024358.

Adding to 331231402 its reverse (204132133), we get a palindrome (535363535).

The spelling of 331231402 in words is "three hundred thirty-one million, two hundred thirty-one thousand, four hundred two".