131231011213 has 4 divisors (see below), whose sum is σ = 138137906560. Its totient is φ = 124324115868.

The previous prime is 131231011181. The next prime is 131231011253. The reversal of 131231011213 is 312110132131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131231011213 - 2⁵ = 131231011181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 6906895327 = 131231011213 / (1 + 3 + 1 + 2 + 3 + 1 + 0 + 1 + 1 + 2 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231011253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3453447645 + ... + 3453447682.

It is an arithmetic number, because the mean of its divisors is an integer number (34534476640).

Almost surely, 2^131231011213 is an apocalyptic number.

It is an amenable number.

131231011213 is a deficient number, since it is larger than the sum of its proper divisors (6906895347).

131231011213 is an equidigital number, since it uses as much as digits as its factorization.

131231011213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6906895346.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 131231011213 its reverse (312110132131), we get a palindrome (443341143344).

The spelling of 131231011213 in words is "one hundred thirty-one billion, two hundred thirty-one million, eleven thousand, two hundred thirteen".