311989909 has 36 divisors (see below), whose sum is σ = 403642764. Its totient is φ = 240240000.

The previous prime is 311989907. The next prime is 311989919. The reversal of 311989909 is 909989113.

It can be written as a sum of positive squares in 2 ways, for example, as 211789809 + 100200100 = 14553^2 + 10010^2 .

It is not a de Polignac number, because 311989909 - 2¹ = 311989907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311989903) 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 in 35 ways as a sum of consecutive naturals, for example, 598569 + ... + 599089.

It is an arithmetic number, because the mean of its divisors is an integer number (11212299).

Almost surely, 2^311989909 is an apocalyptic number.

It is an amenable number.

311989909 is a deficient number, since it is larger than the sum of its proper divisors (91652855).

311989909 is a wasteful number, since it uses less digits than its factorization.

311989909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 49.

The square root of 311989909 is about 17663.2360851572. The cubic root of 311989909 is about 678.2349764055.

The spelling of 311989909 in words is "three hundred eleven million, nine hundred eighty-nine thousand, nine hundred nine".