311244421 has 2 divisors, whose sum is σ = 311244422. Its totient is φ = 311244420.

The previous prime is 311244391. The next prime is 311244431. The reversal of 311244421 is 124442113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213452100 + 97792321 = 14610^2 + 9889^2 .

It is a cyclic number.

It is not a de Polignac number, because 311244421 - 2⁵ = 311244389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311244392 and 311244401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311244431) 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, 155622210 + 155622211.

It is an arithmetic number, because the mean of its divisors is an integer number (155622211).

Almost surely, 2^311244421 is an apocalyptic number.

It is an amenable number.

311244421 is a deficient number, since it is larger than the sum of its proper divisors (1).

311244421 is an equidigital number, since it uses as much as digits as its factorization.

311244421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 22.

The square root of 311244421 is about 17642.1206491737. The cubic root of 311244421 is about 677.6943400220.

Adding to 311244421 its reverse (124442113), we get a palindrome (435686534).

The spelling of 311244421 in words is "three hundred eleven million, two hundred forty-four thousand, four hundred twenty-one".