311212249 has 2 divisors, whose sum is σ = 311212250. Its totient is φ = 311212248.

The previous prime is 311212219. The next prime is 311212259. The reversal of 311212249 is 942212113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310993225 + 219024 = 17635^2 + 468^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311212249 is a prime.

It is not a weakly prime, because it can be changed into another prime (311212219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155606124 + 155606125.

It is an arithmetic number, because the mean of its divisors is an integer number (155606125).

Almost surely, 2^311212249 is an apocalyptic number.

It is an amenable number.

311212249 is a deficient number, since it is larger than the sum of its proper divisors (1).

311212249 is an equidigital number, since it uses as much as digits as its factorization.

311212249 is an evil number, because the sum of its binary digits is even.

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

The square root of 311212249 is about 17641.2088304628. The cubic root of 311212249 is about 677.6709890989.

The spelling of 311212249 in words is "three hundred eleven million, two hundred twelve thousand, two hundred forty-nine".