131113221 has 8 divisors (see below), whose sum is σ = 178537344. Its totient is φ = 85548960.

The previous prime is 131113211. The next prime is 131113223. The reversal of 131113221 is 122311131.

It is a happy number.

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

It is not a de Polignac number, because 131113221 - 2⁵ = 131113189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131113221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131113223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464800 + ... + 465081.

It is an arithmetic number, because the mean of its divisors is an integer number (22317168).

Almost surely, 2^131113221 is an apocalyptic number.

It is an amenable number.

131113221 is a deficient number, since it is larger than the sum of its proper divisors (47424123).

131113221 is an equidigital number, since it uses as much as digits as its factorization.

131113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929931.

The product of its digits is 36, while the sum is 15.

The square root of 131113221 is about 11450.4681563681. The cubic root of 131113221 is about 508.0215815846.

Adding to 131113221 its reverse (122311131), we get a palindrome (253424352).

The spelling of 131113221 in words is "one hundred thirty-one million, one hundred thirteen thousand, two hundred twenty-one".