311648497 has 2 divisors, whose sum is σ = 311648498. Its totient is φ = 311648496.

The previous prime is 311648473. The next prime is 311648531. The reversal of 311648497 is 794846113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254434401 + 57214096 = 15951^2 + 7564^2 .

It is an emirp because it is prime and its reverse (794846113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311648497 is a prime.

It is not a weakly prime, because it can be changed into another prime (311646497) 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, 155824248 + 155824249.

It is an arithmetic number, because the mean of its divisors is an integer number (155824249).

Almost surely, 2^311648497 is an apocalyptic number.

It is an amenable number.

311648497 is a deficient number, since it is larger than the sum of its proper divisors (1).

311648497 is an equidigital number, since it uses as much as digits as its factorization.

311648497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 311648497 is about 17653.5689592785. The cubic root of 311648497 is about 677.9874875505.

The spelling of 311648497 in words is "three hundred eleven million, six hundred forty-eight thousand, four hundred ninety-seven".