123131231321213 has 8 divisors (see below), whose sum is σ = 124945716946488. Its totient is φ = 121320198572544.

The previous prime is 123131231321201. The next prime is 123131231321233. The reversal of 123131231321213 is 312123132131321.

It can be written as a sum of positive squares in 4 ways, for example, as 78152707521604 + 44978523799609 = 8840402^2 + 6706603^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123131231321213 is a prime.

It is a super-2 number, since 2×123131231321213² (a number of 29 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 (123131231321233) 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, 863147306 + ... + 863289947.

It is an arithmetic number, because the mean of its divisors is an integer number (15618214618311).

Almost surely, 2^{123131231321213} is an apocalyptic number.

It is an amenable number.

123131231321213 is a deficient number, since it is larger than the sum of its proper divisors (1814485625275).

123131231321213 is an equidigital number, since it uses as much as digits as its factorization.

123131231321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726438303.

The product of its digits is 3888, while the sum is 29.

Adding to 123131231321213 its reverse (312123132131321), we get a palindrome (435254363452534).

The spelling of 123131231321213 in words is "one hundred twenty-three trillion, one hundred thirty-one billion, two hundred thirty-one million, three hundred twenty-one thousand, two hundred thirteen".