123242131 has 4 divisors (see below), whose sum is σ = 125864352. Its totient is φ = 120619912.

The previous prime is 123242111. The next prime is 123242173. The reversal of 123242131 is 131242321.

It is a happy number.

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 123242131 - 2⁵ = 123242099 is a prime.

It is a super-2 number, since 2×123242131² = 30377245706842322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123242099 and 123242108.

It is not an unprimeable number, because it can be changed into a prime (123242101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1311040 + ... + 1311133.

It is an arithmetic number, because the mean of its divisors is an integer number (31466088).

Almost surely, 2^123242131 is an apocalyptic number.

123242131 is a deficient number, since it is larger than the sum of its proper divisors (2622221).

123242131 is an equidigital number, since it uses as much as digits as its factorization.

123242131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622220.

The product of its digits is 288, while the sum is 19.

The square root of 123242131 is about 11101.4472479943. The cubic root of 123242131 is about 497.6451009802.

Adding to 123242131 its reverse (131242321), we get a palindrome (254484452).

The spelling of 123242131 in words is "one hundred twenty-three million, two hundred forty-two thousand, one hundred thirty-one".