131330221 has 4 divisors (see below), whose sum is σ = 143269344. Its totient is φ = 119391100.

The previous prime is 131330201. The next prime is 131330273. The reversal of 131330221 is 122033131.

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 131330221 - 2⁵ = 131330189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131330195 and 131330204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131330201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5969545 + ... + 5969566.

It is an arithmetic number, because the mean of its divisors is an integer number (35817336).

Almost surely, 2^131330221 is an apocalyptic number.

131330221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131330221 is a deficient number, since it is larger than the sum of its proper divisors (11939123).

131330221 is a wasteful number, since it uses less digits than its factorization.

131330221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11939122.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 131330221 is about 11459.9398340480. The cubic root of 131330221 is about 508.3016955197.

Adding to 131330221 its reverse (122033131), we get a palindrome (253363352).

It can be divided in two parts, 131 and 330221, that multiplied together give a triangular number (43258951 = T₉₃₀₁).

The spelling of 131330221 in words is "one hundred thirty-one million, three hundred thirty thousand, two hundred twenty-one".