1331133231 has 16 divisors (see below), whose sum is σ = 1795824128. Its totient is φ = 876960000.

The previous prime is 1331133229. The next prime is 1331133239. The reversal of 1331133231 is 1323311331.

It is not a de Polignac number, because 1331133231 - 2¹ = 1331133229 is a prime.

It is a super-2 number, since 2×1331133231² = 3543831357344998722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331133198 and 1331133207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331133239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215496 + ... + 221586.

It is an arithmetic number, because the mean of its divisors is an integer number (112239008).

Almost surely, 2^1331133231 is an apocalyptic number.

1331133231 is a deficient number, since it is larger than the sum of its proper divisors (464690897).

1331133231 is an equidigital number, since it uses as much as digits as its factorization.

1331133231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6942.

The product of its digits is 486, while the sum is 21.

The square root of 1331133231 is about 36484.6985872160. The cubic root of 1331133231 is about 1100.0367015303.

Adding to 1331133231 its reverse (1323311331), we get a palindrome (2654444562).

The spelling of 1331133231 in words is "one billion, three hundred thirty-one million, one hundred thirty-three thousand, two hundred thirty-one".