311342261 has 2 divisors, whose sum is σ = 311342262. Its totient is φ = 311342260.

The previous prime is 311342257. The next prime is 311342281. The reversal of 311342261 is 162243113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252206161 + 59136100 = 15881^2 + 7690^2 .

It is a cyclic number.

It is not a de Polignac number, because 311342261 - 2² = 311342257 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311342201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155671130 + 155671131.

It is an arithmetic number, because the mean of its divisors is an integer number (155671131).

Almost surely, 2^311342261 is an apocalyptic number.

It is an amenable number.

311342261 is a deficient number, since it is larger than the sum of its proper divisors (1).

311342261 is an equidigital number, since it uses as much as digits as its factorization.

311342261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 311342261 is about 17644.8933405674. The cubic root of 311342261 is about 677.7653438839.

Adding to 311342261 its reverse (162243113), we get a palindrome (473585374).

The spelling of 311342261 in words is "three hundred eleven million, three hundred forty-two thousand, two hundred sixty-one".