311325221 has 2 divisors, whose sum is σ = 311325222. Its totient is φ = 311325220.

The previous prime is 311325211. The next prime is 311325229. The reversal of 311325221 is 122523113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 288150625 + 23174596 = 16975^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 311325221 - 2¹⁰ = 311324197 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 311325193 and 311325202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311325229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155662610 + 155662611.

It is an arithmetic number, because the mean of its divisors is an integer number (155662611).

Almost surely, 2^311325221 is an apocalyptic number.

It is an amenable number.

311325221 is a deficient number, since it is larger than the sum of its proper divisors (1).

311325221 is an equidigital number, since it uses as much as digits as its factorization.

311325221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 311325221 is about 17644.4104747084. The cubic root of 311325221 is about 677.7529787865.

Adding to 311325221 its reverse (122523113), we get a palindrome (433848334).

The spelling of 311325221 in words is "three hundred eleven million, three hundred twenty-five thousand, two hundred twenty-one".