311212201 has 2 divisors, whose sum is σ = 311212202. Its totient is φ = 311212200.

The previous prime is 311212171. The next prime is 311212219. The reversal of 311212201 is 102212113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309584025 + 1628176 = 17595^2 + 1276^2 .

It is an emirp because it is prime and its reverse (102212113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311212201 - 2⁵ = 311212169 is a prime.

It is not a weakly prime, because it can be changed into another prime (311212261) 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, 155606100 + 155606101.

It is an arithmetic number, because the mean of its divisors is an integer number (155606101).

Almost surely, 2^311212201 is an apocalyptic number.

It is an amenable number.

311212201 is a deficient number, since it is larger than the sum of its proper divisors (1).

311212201 is an equidigital number, since it uses as much as digits as its factorization.

311212201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 311212201 is about 17641.2074700118. The cubic root of 311212201 is about 677.6709542586.

Adding to 311212201 its reverse (102212113), we get a palindrome (413424314).

The spelling of 311212201 in words is "three hundred eleven million, two hundred twelve thousand, two hundred one".