311221093 has 2 divisors, whose sum is σ = 311221094. Its totient is φ = 311221092.

The previous prime is 311221081. The next prime is 311221103. The reversal of 311221093 is 390122113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245172964 + 66048129 = 15658^2 + 8127^2 .

It is a cyclic number.

It is not a de Polignac number, because 311221093 - 2⁵ = 311221061 is a prime.

It is a super-2 number, since 2×311221093² = 193717137456229298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311221003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155610546 + 155610547.

It is an arithmetic number, because the mean of its divisors is an integer number (155610547).

Almost surely, 2^311221093 is an apocalyptic number.

It is an amenable number.

311221093 is a deficient number, since it is larger than the sum of its proper divisors (1).

311221093 is an equidigital number, since it uses as much as digits as its factorization.

311221093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 311221093 is about 17641.4594917768. The cubic root of 311221093 is about 677.6774083679.

The spelling of 311221093 in words is "three hundred eleven million, two hundred twenty-one thousand, ninety-three".