123131023 has 4 divisors (see below), whose sum is σ = 125750880. Its totient is φ = 120511168.

The previous prime is 123131009. The next prime is 123131033. The reversal of 123131023 is 320131321.

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 123131023 - 2⁵ = 123130991 is a prime.

It is a super-3 number, since 3×123131023³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123130988 and 123131006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131033) 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, 1309858 + ... + 1309951.

It is an arithmetic number, because the mean of its divisors is an integer number (31437720).

Almost surely, 2^123131023 is an apocalyptic number.

123131023 is a deficient number, since it is larger than the sum of its proper divisors (2619857).

123131023 is an equidigital number, since it uses as much as digits as its factorization.

123131023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619856.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 123131023 is about 11096.4419072061. The cubic root of 123131023 is about 497.4955066385.

Adding to 123131023 its reverse (320131321), we get a palindrome (443262344).

The spelling of 123131023 in words is "one hundred twenty-three million, one hundred thirty-one thousand, twenty-three".