131223101231 has 6 divisors (see below), whose sum is σ = 131885867232. Its totient is φ = 130563649260.

The previous prime is 131223101227. The next prime is 131223101249. The reversal of 131223101231 is 132101322131.

It is a happy number.

It is not a de Polignac number, because 131223101231 - 2² = 131223101227 is a prime.

It is a super-2 number, since 2×131223101231² (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 (131223101291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1617215 + ... + 1696416.

It is an arithmetic number, because the mean of its divisors is an integer number (21980977872).

Almost surely, 2^131223101231 is an apocalyptic number.

131223101231 is a deficient number, since it is larger than the sum of its proper divisors (662766001).

131223101231 is an frugal number, since it uses more digits than its factorization.

131223101231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314029 (or 3313830 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 131223101231 its reverse (132101322131), we get a palindrome (263324423362).

The spelling of 131223101231 in words is "one hundred thirty-one billion, two hundred twenty-three million, one hundred one thousand, two hundred thirty-one".