131220131231 has 16 divisors (see below), whose sum is σ = 156667613184. Its totient is φ = 107459430144.

The previous prime is 131220131213. The next prime is 131220131279. The reversal of 131220131231 is 132131022131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131220131231 - 2¹⁰ = 131220130207 is a prime.

It is a super-2 number, since 2×131220131231² (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 (131220130231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 333266 + ... + 611151.

It is an arithmetic number, because the mean of its divisors is an integer number (9791725824).

Almost surely, 2^131220131231 is an apocalyptic number.

131220131231 is a deficient number, since it is larger than the sum of its proper divisors (25447481953).

131220131231 is an equidigital number, since it uses as much as digits as its factorization.

131220131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945310.

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

Adding to 131220131231 its reverse (132131022131), we get a palindrome (263351153362).

The spelling of 131220131231 in words is "one hundred thirty-one billion, two hundred twenty million, one hundred thirty-one thousand, two hundred thirty-one".