123131113331 has 4 divisors (see below), whose sum is σ = 123131832600. Its totient is φ = 123130394064.

The previous prime is 123131113321. The next prime is 123131113349. The reversal of 123131113331 is 133311131321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 133311131321 = 7573 ⋅17603477.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123131113331 is a prime.

It is a super-2 number, since 2×123131113331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123131113297 and 123131113306.

It is not an unprimeable number, because it can be changed into a prime (123131113321) 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, 61655 + ... + 500063.

It is an arithmetic number, because the mean of its divisors is an integer number (30782958150).

Almost surely, 2^123131113331 is an apocalyptic number.

123131113331 is a deficient number, since it is larger than the sum of its proper divisors (719269).

123131113331 is an equidigital number, since it uses as much as digits as its factorization.

123131113331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719268.

The product of its digits is 486, while the sum is 23.

Adding to 123131113331 its reverse (133311131321), we get a palindrome (256442244652).

The spelling of 123131113331 in words is "one hundred twenty-three billion, one hundred thirty-one million, one hundred thirteen thousand, three hundred thirty-one".