1331120231 has 8 divisors (see below), whose sum is σ = 1552327200. Its totient is φ = 1140959904.

The previous prime is 1331120207. The next prime is 1331120237. The reversal of 1331120231 is 1320211331.

It is a de Polignac number, because none of the positive numbers 2^k-1331120231 is a prime.

It is a super-2 number, since 2×1331120231² = 3543762138754986722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331120237) 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 7 ways as a sum of consecutive naturals, for example, 1940066 + ... + 1940751.

It is an arithmetic number, because the mean of its divisors is an integer number (194040900).

Almost surely, 2^1331120231 is an apocalyptic number.

1331120231 is a deficient number, since it is larger than the sum of its proper divisors (221206969).

1331120231 is an frugal number, since it uses more digits than its factorization.

1331120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3880838 (or 3880824 counting only the distinct ones).

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

The square root of 1331120231 is about 36484.5204299029. The cubic root of 1331120231 is about 1100.0331204904.

Adding to 1331120231 its reverse (1320211331), we get a palindrome (2651331562).

The spelling of 1331120231 in words is "one billion, three hundred thirty-one million, one hundred twenty thousand, two hundred thirty-one".