331130221 has 2 divisors, whose sum is σ = 331130222. Its totient is φ = 331130220.

The previous prime is 331130213. The next prime is 331130249. The reversal of 331130221 is 122031133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275925321 + 55204900 = 16611^2 + 7430^2 .

It is a cyclic number.

It is not a de Polignac number, because 331130221 - 2³ = 331130213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331130195 and 331130204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331130201) 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 as a sum of consecutive naturals, namely, 165565110 + 165565111.

It is an arithmetic number, because the mean of its divisors is an integer number (165565111).

Almost surely, 2^331130221 is an apocalyptic number.

It is an amenable number.

331130221 is a deficient number, since it is larger than the sum of its proper divisors (1).

331130221 is an equidigital number, since it uses as much as digits as its factorization.

331130221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 331130221 is about 18196.9838434835. The cubic root of 331130221 is about 691.8303437934.

Adding to 331130221 its reverse (122031133), we get a palindrome (453161354).

It can be divided in two parts, 3311 and 30221, that multiplied together give a triangular number (100061731 = T₁₄₁₄₆).

The spelling of 331130221 in words is "three hundred thirty-one million, one hundred thirty thousand, two hundred twenty-one".