1231333131 has 8 divisors (see below), whose sum is σ = 1876317184. Its totient is φ = 703618920.

The previous prime is 1231333111. The next prime is 1231333139. The reversal of 1231333131 is 1313331321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231333131 - 2¹⁵ = 1231300363 is a prime.

It is a super-2 number, since 2×1231333131² = 3032362558996526322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 58634911 = 1231333131 / (1 + 2 + 3 + 1 + 3 + 3 + 3 + 1 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1231333098 and 1231333107.

It is not an unprimeable number, because it can be changed into a prime (1231333139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29317435 + ... + 29317476.

It is an arithmetic number, because the mean of its divisors is an integer number (234539648).

Almost surely, 2^1231333131 is an apocalyptic number.

1231333131 is a deficient number, since it is larger than the sum of its proper divisors (644984053).

1231333131 is an equidigital number, since it uses as much as digits as its factorization.

1231333131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58634921.

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

The square root of 1231333131 is about 35090.3566667539. The cubic root of 1231333131 is about 1071.8282224920.

Adding to 1231333131 its reverse (1313331321), we get a palindrome (2544664452).

It can be divided in two parts, 1 and 231333131, that added together give a palindrome (231333132).

The spelling of 1231333131 in words is "one billion, two hundred thirty-one million, three hundred thirty-three thousand, one hundred thirty-one".