131142221 has 4 divisors (see below), whose sum is σ = 149876832. Its totient is φ = 112407612.

The previous prime is 131142211. The next prime is 131142227. The reversal of 131142221 is 122241131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131142221 - 2¹⁴ = 131125837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131142221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131142227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9367295 + ... + 9367308.

It is an arithmetic number, because the mean of its divisors is an integer number (37469208).

Almost surely, 2^131142221 is an apocalyptic number.

It is an amenable number.

131142221 is a deficient number, since it is larger than the sum of its proper divisors (18734611).

131142221 is an equidigital number, since it uses as much as digits as its factorization.

131142221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18734610.

The product of its digits is 96, while the sum is 17.

The square root of 131142221 is about 11451.7344101232. The cubic root of 131142221 is about 508.0590340492.

Adding to 131142221 its reverse (122241131), we get a palindrome (253383352).

The spelling of 131142221 in words is "one hundred thirty-one million, one hundred forty-two thousand, two hundred twenty-one".