123123131 has 4 divisors (see below), whose sum is σ = 123190200. Its totient is φ = 123056064.

The previous prime is 123123107. The next prime is 123123137. The reversal of 123123131 is 131321321.

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 123123131 - 2¹⁴ = 123106747 is a prime.

It is a super-2 number, since 2×123123131² = 30318610774486322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123123137) 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, 30701 + ... + 34478.

It is an arithmetic number, because the mean of its divisors is an integer number (30797550).

Almost surely, 2^123123131 is an apocalyptic number.

123123131 is a deficient number, since it is larger than the sum of its proper divisors (67069).

123123131 is an equidigital number, since it uses as much as digits as its factorization.

123123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67068.

The product of its digits is 108, while the sum is 17.

The square root of 123123131 is about 11096.0862920221. The cubic root of 123123131 is about 497.4848775316.

Adding to 123123131 its reverse (131321321), we get a palindrome (254444452).

The spelling of 123123131 in words is "one hundred twenty-three million, one hundred twenty-three thousand, one hundred thirty-one".