311680321 has 2 divisors, whose sum is σ = 311680322. Its totient is φ = 311680320.

The previous prime is 311680279. The next prime is 311680331. The reversal of 311680321 is 123086113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308494096 + 3186225 = 17564^2 + 1785^2 .

It is a cyclic number.

It is not a de Polignac number, because 311680321 - 2¹¹ = 311678273 is a prime.

It is not a weakly prime, because it can be changed into another prime (311680331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155840160 + 155840161.

It is an arithmetic number, because the mean of its divisors is an integer number (155840161).

Almost surely, 2^311680321 is an apocalyptic number.

It is an amenable number.

311680321 is a deficient number, since it is larger than the sum of its proper divisors (1).

311680321 is an equidigital number, since it uses as much as digits as its factorization.

311680321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 311680321 is about 17654.4702837553. The cubic root of 311680321 is about 678.0105643391.

The spelling of 311680321 in words is "three hundred eleven million, six hundred eighty thousand, three hundred twenty-one".