1131201331 has 12 divisors (see below), whose sum is σ = 1226843712. Its totient is φ = 1042538016.

The previous prime is 1131201329. The next prime is 1131201343. The reversal of 1131201331 is 1331021311.

It is not a de Polignac number, because 1131201331 - 2¹ = 1131201329 is a prime.

It is a super-2 number, since 2×1131201331² = 2559232902512343122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131201361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109470 + ... + 119356.

It is an arithmetic number, because the mean of its divisors is an integer number (102236976).

Almost surely, 2^1131201331 is an apocalyptic number.

1131201331 is a deficient number, since it is larger than the sum of its proper divisors (95642381).

1131201331 is an equidigital number, since it uses as much as digits as its factorization.

1131201331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10590 (or 10577 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1131201331 is about 33633.3366022463. The cubic root of 1131201331 is about 1041.9494165711.

Adding to 1131201331 its reverse (1331021311), we get a palindrome (2462222642).

The spelling of 1131201331 in words is "one billion, one hundred thirty-one million, two hundred one thousand, three hundred thirty-one".