1331131331 has 4 divisors (see below), whose sum is σ = 1409433192. Its totient is φ = 1252829472.

The previous prime is 1331131327. The next prime is 1331131343. The reversal of 1331131331 is 1331311331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1331131331 - 2² = 1331131327 is a prime.

It is a super-2 number, since 2×1331131331² = 3543821240739663122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331131381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39150905 + ... + 39150938.

It is an arithmetic number, because the mean of its divisors is an integer number (352358298).

Almost surely, 2^1331131331 is an apocalyptic number.

1331131331 is a deficient number, since it is larger than the sum of its proper divisors (78301861).

1331131331 is an equidigital number, since it uses as much as digits as its factorization.

1331131331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78301860.

The product of its digits is 243, while the sum is 20.

The square root of 1331131331 is about 36484.6725488937. The cubic root of 1331131331 is about 1100.0361781490.

Adding to 1331131331 its reverse (1331311331), we get a palindrome (2662442662).

The spelling of 1331131331 in words is "one billion, three hundred thirty-one million, one hundred thirty-one thousand, three hundred thirty-one".