311909477989 has 4 divisors (see below), whose sum is σ = 322664977260. Its totient is φ = 301153978720.

The previous prime is 311909477941. The next prime is 311909478029. The reversal of 311909477989 is 989774909113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99876857089 + 212032620900 = 316033^2 + 460470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311909477989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311909477489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5377749592 + ... + 5377749649.

It is an arithmetic number, because the mean of its divisors is an integer number (80666244315).

Almost surely, 2^311909477989 is an apocalyptic number.

It is an amenable number.

311909477989 is a deficient number, since it is larger than the sum of its proper divisors (10755499271).

311909477989 is a wasteful number, since it uses less digits than its factorization.

311909477989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10755499270.

The product of its (nonzero) digits is 30862944, while the sum is 67.

The spelling of 311909477989 in words is "three hundred eleven billion, nine hundred nine million, four hundred seventy-seven thousand, nine hundred eighty-nine".