131220340423 has 4 divisors (see below), whose sum is σ = 131793355240. Its totient is φ = 130647325608.

The previous prime is 131220340421. The next prime is 131220340457. The reversal of 131220340423 is 324043022131.

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 131220340423 - 2¹ = 131220340421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131220340421) 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, 286507065 + ... + 286507522.

It is an arithmetic number, because the mean of its divisors is an integer number (32948338810).

Almost surely, 2^131220340423 is an apocalyptic number.

131220340423 is a deficient number, since it is larger than the sum of its proper divisors (573014817).

131220340423 is an equidigital number, since it uses as much as digits as its factorization.

131220340423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573014816.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 131220340423 its reverse (324043022131), we get a palindrome (455263362554).

The spelling of 131220340423 in words is "one hundred thirty-one billion, two hundred twenty million, three hundred forty thousand, four hundred twenty-three".