131020223231 has 4 divisors (see below), whose sum is σ = 131024341632. Its totient is φ = 131016104832.

The previous prime is 131020223221. The next prime is 131020223249. The reversal of 131020223231 is 132322020131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131020223231 is a prime.

It is a super-2 number, since 2×131020223231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131020223221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2011106 + ... + 2075231.

It is an arithmetic number, because the mean of its divisors is an integer number (32756085408).

Almost surely, 2^131020223231 is an apocalyptic number.

131020223231 is a deficient number, since it is larger than the sum of its proper divisors (4118401).

131020223231 is an equidigital number, since it uses as much as digits as its factorization.

131020223231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4118400.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 131020223231 its reverse (132322020131), we get a palindrome (263342243362).

The spelling of 131020223231 in words is "one hundred thirty-one billion, twenty million, two hundred twenty-three thousand, two hundred thirty-one".