311621249 has 2 divisors, whose sum is σ = 311621250. Its totient is φ = 311621248.

The previous prime is 311621173. The next prime is 311621263. The reversal of 311621249 is 942126113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 267159025 + 44462224 = 16345^2 + 6668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311621249 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (311621449) 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, 155810624 + 155810625.

It is an arithmetic number, because the mean of its divisors is an integer number (155810625).

Almost surely, 2^311621249 is an apocalyptic number.

It is an amenable number.

311621249 is a deficient number, since it is larger than the sum of its proper divisors (1).

311621249 is an equidigital number, since it uses as much as digits as its factorization.

311621249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 311621249 is about 17652.7972004439. The cubic root of 311621249 is about 677.9677277446.

The spelling of 311621249 in words is "three hundred eleven million, six hundred twenty-one thousand, two hundred forty-nine".