331322261 has 2 divisors, whose sum is σ = 331322262. Its totient is φ = 331322260.

The previous prime is 331322227. The next prime is 331322273. The reversal of 331322261 is 162223133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190164100 + 141158161 = 13790^2 + 11881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331322261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331322461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165661130 + 165661131.

It is an arithmetic number, because the mean of its divisors is an integer number (165661131).

Almost surely, 2^331322261 is an apocalyptic number.

It is an amenable number.

331322261 is a deficient number, since it is larger than the sum of its proper divisors (1).

331322261 is an equidigital number, since it uses as much as digits as its factorization.

331322261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 23.

The square root of 331322261 is about 18202.2597772914. The cubic root of 331322261 is about 691.9640609990.

Adding to 331322261 its reverse (162223133), we get a palindrome (493545394).

The spelling of 331322261 in words is "three hundred thirty-one million, three hundred twenty-two thousand, two hundred sixty-one".