1231131433 has 8 divisors (see below), whose sum is σ = 1411185152. Its totient is φ = 1052122176.

The previous prime is 1231131413. The next prime is 1231131443. The reversal of 1231131433 is 3341311321.

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

It is not a de Polignac number, because 1231131433 - 2⁵ = 1231131401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231131413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258585 + ... + 263302.

It is an arithmetic number, because the mean of its divisors is an integer number (176398144).

Almost surely, 2^1231131433 is an apocalyptic number.

It is an amenable number.

1231131433 is a deficient number, since it is larger than the sum of its proper divisors (180053719).

1231131433 is an equidigital number, since it uses as much as digits as its factorization.

1231131433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522231.

The product of its digits is 648, while the sum is 22.

The square root of 1231131433 is about 35087.4825685742. The cubic root of 1231131433 is about 1071.7696958409.

Adding to 1231131433 its reverse (3341311321), we get a palindrome (4572442754).

The spelling of 1231131433 in words is "one billion, two hundred thirty-one million, one hundred thirty-one thousand, four hundred thirty-three".