1213231131 has 24 divisors (see below), whose sum is σ = 2043672800. Its totient is φ = 693273168.

The previous prime is 1213231079. The next prime is 1213231139. The reversal of 1213231131 is 1311323121.

It is not a de Polignac number, because 1213231131 - 2⁶ = 1213231067 is a prime.

It is a super-2 number, since 2×1213231131² = 2943859554455078322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213231139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193420 + ... + 199593.

Almost surely, 2^1213231131 is an apocalyptic number.

1213231131 is a deficient number, since it is larger than the sum of its proper divisors (830441669).

1213231131 is an equidigital number, since it uses as much as digits as its factorization.

1213231131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393040 (or 393023 counting only the distinct ones).

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

The square root of 1213231131 is about 34831.4675401425. The cubic root of 1213231131 is about 1066.5499062408.

Adding to 1213231131 its reverse (1311323121), we get a palindrome (2524554252).

The spelling of 1213231131 in words is "one billion, two hundred thirteen million, two hundred thirty-one thousand, one hundred thirty-one".