123113012131 has 4 divisors (see below), whose sum is σ = 123154705912. Its totient is φ = 123071318352.

The previous prime is 123113012129. The next prime is 123113012137. The reversal of 123113012131 is 131210311321.

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 123113012131 - 2¹ = 123113012129 is a prime.

It is a super-2 number, since 2×123113012131² (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 = 123113012099 and 123113012108.

It is not an unprimeable number, because it can be changed into a prime (123113012137) 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, 20842461 + ... + 20848366.

It is an arithmetic number, because the mean of its divisors is an integer number (30788676478).

Almost surely, 2^123113012131 is an apocalyptic number.

123113012131 is a deficient number, since it is larger than the sum of its proper divisors (41693781).

123113012131 is an equidigital number, since it uses as much as digits as its factorization.

123113012131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41693780.

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

Adding to 123113012131 its reverse (131210311321), we get a palindrome (254323323452).

The spelling of 123113012131 in words is "one hundred twenty-three billion, one hundred thirteen million, twelve thousand, one hundred thirty-one".