311340761 has 2 divisors, whose sum is σ = 311340762. Its totient is φ = 311340760.

The previous prime is 311340749. The next prime is 311340763. The reversal of 311340761 is 167043113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 302099161 + 9241600 = 17381^2 + 3040^2 .

It is a cyclic number.

It is not a de Polignac number, because 311340761 - 2¹⁸ = 311078617 is a prime.

Together with 311340763, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311340761.

It is not a weakly prime, because it can be changed into another prime (311340763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155670380 + 155670381.

It is an arithmetic number, because the mean of its divisors is an integer number (155670381).

Almost surely, 2^311340761 is an apocalyptic number.

It is an amenable number.

311340761 is a deficient number, since it is larger than the sum of its proper divisors (1).

311340761 is an equidigital number, since it uses as much as digits as its factorization.

311340761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 311340761 is about 17644.8508353004. The cubic root of 311340761 is about 677.7642554251.

Adding to 311340761 its reverse (167043113), we get a palindrome (478383874).

The spelling of 311340761 in words is "three hundred eleven million, three hundred forty thousand, seven hundred sixty-one".