311981473 has 2 divisors, whose sum is σ = 311981474. Its totient is φ = 311981472.

The previous prime is 311981471. The next prime is 311981491. The reversal of 311981473 is 374189113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310570129 + 1411344 = 17623^2 + 1188^2 .

It is a cyclic number.

It is not a de Polignac number, because 311981473 - 2¹ = 311981471 is a prime.

Together with 311981471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (311981471) 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, 155990736 + 155990737.

It is an arithmetic number, because the mean of its divisors is an integer number (155990737).

Almost surely, 2^311981473 is an apocalyptic number.

It is an amenable number.

311981473 is a deficient number, since it is larger than the sum of its proper divisors (1).

311981473 is an equidigital number, since it uses as much as digits as its factorization.

311981473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 311981473 is about 17662.9972824546. The cubic root of 311981473 is about 678.2288633426.

The spelling of 311981473 in words is "three hundred eleven million, nine hundred eighty-one thousand, four hundred seventy-three".