311981318 has 12 divisors (see below), whose sum is σ = 514382820. Its totient is φ = 141809580.

The previous prime is 311981317. The next prime is 311981323. The reversal of 311981318 is 813189113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311981317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 644348 + ... + 644831.

It is an arithmetic number, because the mean of its divisors is an integer number (42865235).

Almost surely, 2^311981318 is an apocalyptic number.

311981318 is a deficient number, since it is larger than the sum of its proper divisors (202401502).

311981318 is a wasteful number, since it uses less digits than its factorization.

311981318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289203 (or 1289192 counting only the distinct ones).

The product of its digits is 5184, while the sum is 35.

The square root of 311981318 is about 17662.9928947503. The cubic root of 311981318 is about 678.2287510223.

The spelling of 311981318 in words is "three hundred eleven million, nine hundred eighty-one thousand, three hundred eighteen".