311648971 has 2 divisors, whose sum is σ = 311648972. Its totient is φ = 311648970.

The previous prime is 311648969. The next prime is 311648989. The reversal of 311648971 is 179846113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311648971 - 2¹ = 311648969 is a prime.

It is a super-2 number, since 2×311648971² = 194250162250717682, which contains 22 as substring.

Together with 311648969, it forms a pair of twin primes.

It is equal to p_16848652 and since 311648971 and 16848652 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (311648171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155824485 + 155824486.

It is an arithmetic number, because the mean of its divisors is an integer number (155824486).

Almost surely, 2^311648971 is an apocalyptic number.

311648971 is a deficient number, since it is larger than the sum of its proper divisors (1).

311648971 is an equidigital number, since it uses as much as digits as its factorization.

311648971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 311648971 is about 17653.5823843208. The cubic root of 311648971 is about 677.9878312774.

The spelling of 311648971 in words is "three hundred eleven million, six hundred forty-eight thousand, nine hundred seventy-one".