331232281 has 2 divisors, whose sum is σ = 331232282. Its totient is φ = 331232280.

The previous prime is 331232273. The next prime is 331232299. The reversal of 331232281 is 182232133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296528400 + 34703881 = 17220^2 + 5891^2 .

It is an emirp because it is prime and its reverse (182232133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331232281 - 2³ = 331232273 is a prime.

It is a super-2 number, since 2×331232281² = 219429647952925922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331232261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165616140 + 165616141.

It is an arithmetic number, because the mean of its divisors is an integer number (165616141).

Almost surely, 2^331232281 is an apocalyptic number.

It is an amenable number.

331232281 is a deficient number, since it is larger than the sum of its proper divisors (1).

331232281 is an equidigital number, since it uses as much as digits as its factorization.

331232281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 331232281 is about 18199.7879383250. The cubic root of 331232281 is about 691.9014144754.

The spelling of 331232281 in words is "three hundred thirty-one million, two hundred thirty-two thousand, two hundred eighty-one".