231020120131 has 8 divisors (see below), whose sum is σ = 241450110720. Its totient is φ = 220754381568.

The previous prime is 231020120117. The next prime is 231020120137. The reversal of 231020120131 is 131021020132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231020120131 - 2⁷ = 231020120003 is a prime.

It is a super-2 number, since 2×231020120131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231020120137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41060131 + ... + 41065756.

It is an arithmetic number, because the mean of its divisors is an integer number (30181263840).

Almost surely, 2^231020120131 is an apocalyptic number.

231020120131 is a deficient number, since it is larger than the sum of its proper divisors (10429990589).

231020120131 is an equidigital number, since it uses as much as digits as its factorization.

231020120131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82126013.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 231020120131 its reverse (131021020132), we get a palindrome (362041140263).

Subtracting from 231020120131 its reverse (131021020132), we obtain a palindrome (99999099999).

It can be divided in two parts, 2310201 and 20131, that added together give a palindrome (2330332).

The spelling of 231020120131 in words is "two hundred thirty-one billion, twenty million, one hundred twenty thousand, one hundred thirty-one".