1231130331 has 12 divisors (see below), whose sum is σ = 1790078160. Its totient is φ = 815317200.

The previous prime is 1231130279. The next prime is 1231130353. The reversal of 1231130331 is 1330311321.

It is a happy number.

It is not a de Polignac number, because 1231130331 - 2²⁷ = 1096912603 is a prime.

It is a super-2 number, since 2×1231130331² = 3031363783816339122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231131331) 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, 451596 + ... + 454313.

It is an arithmetic number, because the mean of its divisors is an integer number (149173180).

Almost surely, 2^1231130331 is an apocalyptic number.

1231130331 is a deficient number, since it is larger than the sum of its proper divisors (558947829).

1231130331 is a wasteful number, since it uses less digits than its factorization.

1231130331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906066 (or 906063 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1231130331 is about 35087.4668649648. The cubic root of 1231130331 is about 1071.7693760563.

Adding to 1231130331 its reverse (1330311321), we get a palindrome (2561441652).

The spelling of 1231130331 in words is "one billion, two hundred thirty-one million, one hundred thirty thousand, three hundred thirty-one".