131312123 has 4 divisors (see below), whose sum is σ = 131978880. Its totient is φ = 130645368.

The previous prime is 131312047. The next prime is 131312147. The reversal of 131312123 is 321213131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321213131 = 79 ⋅4065989.

It is a cyclic number.

It is not a de Polignac number, because 131312123 - 2⁸ = 131311867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131311123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333083 + ... + 333476.

It is an arithmetic number, because the mean of its divisors is an integer number (32994720).

Almost surely, 2^131312123 is an apocalyptic number.

131312123 is a deficient number, since it is larger than the sum of its proper divisors (666757).

131312123 is an equidigital number, since it uses as much as digits as its factorization.

131312123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666756.

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

The square root of 131312123 is about 11459.1501866412. The cubic root of 131312123 is about 508.2783455585.

Adding to 131312123 its reverse (321213131), we get a palindrome (452525254).

The spelling of 131312123 in words is "one hundred thirty-one million, three hundred twelve thousand, one hundred twenty-three".