12131231231 has 8 divisors (see below), whose sum is σ = 14039761920. Its totient is φ = 10266574968.

The previous prime is 12131231227. The next prime is 12131231267. The reversal of 12131231231 is 13213213121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12131231231 - 2² = 12131231227 is a prime.

It is a super-2 number, since 2×12131231231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131231291) 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, 10968011 + ... + 10969116.

It is an arithmetic number, because the mean of its divisors is an integer number (1754970240).

Almost surely, 2^12131231231 is an apocalyptic number.

12131231231 is a deficient number, since it is larger than the sum of its proper divisors (1908530689).

12131231231 is an equidigital number, since it uses as much as digits as its factorization.

12131231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21937213.

The product of its digits is 216, while the sum is 20.

Adding to 12131231231 its reverse (13213213121), we get a palindrome (25344444352).

The spelling of 12131231231 in words is "twelve billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-one".