331221131 has 8 divisors (see below), whose sum is σ = 340804464. Its totient is φ = 321723360.

The previous prime is 331221127. The next prime is 331221139. The reversal of 331221131 is 131122133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 331221131 - 2² = 331221127 is a prime.

It is a super-2 number, since 2×331221131² = 219414875241838322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331221139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13496 + ... + 29061.

It is an arithmetic number, because the mean of its divisors is an integer number (42600558).

Almost surely, 2^331221131 is an apocalyptic number.

331221131 is a deficient number, since it is larger than the sum of its proper divisors (9583333).

331221131 is a wasteful number, since it uses less digits than its factorization.

331221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42781.

The product of its digits is 108, while the sum is 17.

The square root of 331221131 is about 18199.4816134966. The cubic root of 331221131 is about 691.8936507521.

Adding to 331221131 its reverse (131122133), we get a palindrome (462343264).

The spelling of 331221131 in words is "three hundred thirty-one million, two hundred twenty-one thousand, one hundred thirty-one".