123031113131 has 4 divisors (see below), whose sum is σ = 123158343792. Its totient is φ = 122903882472.

The previous prime is 123031113071. The next prime is 123031113143. The reversal of 123031113131 is 131311130321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123031113131 - 2²² = 123026918827 is a prime.

It is a super-2 number, since 2×123031113131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123031113031) 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, 63613880 + ... + 63615813.

It is an arithmetic number, because the mean of its divisors is an integer number (30789585948).

Almost surely, 2^123031113131 is an apocalyptic number.

123031113131 is a deficient number, since it is larger than the sum of its proper divisors (127230661).

123031113131 is an equidigital number, since it uses as much as digits as its factorization.

123031113131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127230660.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 123031113131 its reverse (131311130321), we get a palindrome (254342243452).

The spelling of 123031113131 in words is "one hundred twenty-three billion, thirty-one million, one hundred thirteen thousand, one hundred thirty-one".