311310661 has 2 divisors, whose sum is σ = 311310662. Its totient is φ = 311310660.

The previous prime is 311310653. The next prime is 311310667. The reversal of 311310661 is 166013113.

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., 218862436 + 92448225 = 14794^2 + 9615^2 .

It is a cyclic number.

It is not a de Polignac number, because 311310661 - 2³ = 311310653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311310667) 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, 155655330 + 155655331.

It is an arithmetic number, because the mean of its divisors is an integer number (155655331).

Almost surely, 2^311310661 is an apocalyptic number.

It is an amenable number.

311310661 is a deficient number, since it is larger than the sum of its proper divisors (1).

311310661 is an equidigital number, since it uses as much as digits as its factorization.

311310661 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 311310661 is about 17643.9978746315. The cubic root of 311310661 is about 677.7424129467.

Adding to 311310661 its reverse (166013113), we get a palindrome (477323774).

The spelling of 311310661 in words is "three hundred eleven million, three hundred ten thousand, six hundred sixty-one".