131223312331 has 4 divisors (see below), whose sum is σ = 131289622200. Its totient is φ = 131157002464.

The previous prime is 131223312317. The next prime is 131223312397. The reversal of 131223312331 is 133213322131.

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 131223312331 - 2¹⁷ = 131223181259 is a prime.

It is a super-2 number, since 2×131223312331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131223312296 and 131223312305.

It is not an unprimeable number, because it can be changed into a prime (131223312431) 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, 33151966 + ... + 33155923.

It is an arithmetic number, because the mean of its divisors is an integer number (32822405550).

Almost surely, 2^131223312331 is an apocalyptic number.

131223312331 is a deficient number, since it is larger than the sum of its proper divisors (66309869).

131223312331 is an equidigital number, since it uses as much as digits as its factorization.

131223312331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66309868.

The product of its digits is 1944, while the sum is 25.

Adding to 131223312331 its reverse (133213322131), we get a palindrome (264436634462).

The spelling of 131223312331 in words is "one hundred thirty-one billion, two hundred twenty-three million, three hundred twelve thousand, three hundred thirty-one".