311430641 has 2 divisors, whose sum is σ = 311430642. Its totient is φ = 311430640.

The previous prime is 311430631. The next prime is 311430643. The reversal of 311430641 is 146034113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224400400 + 87030241 = 14980^2 + 9329^2 .

It is an emirp because it is prime and its reverse (146034113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311430641 is a prime.

Together with 311430643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (311430643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155715320 + 155715321.

It is an arithmetic number, because the mean of its divisors is an integer number (155715321).

Almost surely, 2^311430641 is an apocalyptic number.

It is an amenable number.

311430641 is a deficient number, since it is larger than the sum of its proper divisors (1).

311430641 is an equidigital number, since it uses as much as digits as its factorization.

311430641 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 23.

The square root of 311430641 is about 17647.3975701801. The cubic root of 311430641 is about 677.8294697046.

Adding to 311430641 its reverse (146034113), we get a palindrome (457464754).

The spelling of 311430641 in words is "three hundred eleven million, four hundred thirty thousand, six hundred forty-one".