1131221331 has 12 divisors (see below), whose sum is σ = 1634424480. Its totient is φ = 753945360.

The previous prime is 1131221309. The next prime is 1131221363. The reversal of 1131221331 is 1331221311.

1131221331 is a `hidden beast` number, since 1 + 1 + 312 + 21 + 331 = 666.

It is not a de Polignac number, because 1131221331 - 2⁹ = 1131220819 is a prime.

It is a super-2 number, since 2×1131221331² = 2559323399418823122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1131221381) 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, 23725 + ... + 53153.

It is an arithmetic number, because the mean of its divisors is an integer number (136202040).

Almost surely, 2^1131221331 is an apocalyptic number.

1131221331 is a deficient number, since it is larger than the sum of its proper divisors (503203149).

1131221331 is a wasteful number, since it uses less digits than its factorization.

1131221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33706 (or 33703 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1131221331 is about 33633.6339249865. The cubic root of 1131221331 is about 1041.9555572008.

Adding to 1131221331 its reverse (1331221311), we get a palindrome (2462442642).

The spelling of 1131221331 in words is "one billion, one hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-one".