31311333811 has 2 divisors, whose sum is σ = 31311333812. Its totient is φ = 31311333810.

The previous prime is 31311333773. The next prime is 31311333821. The reversal of 31311333811 is 11833311313.

It is a strong prime.

It is an emirp because it is prime and its reverse (11833311313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31311333811 - 2¹⁷ = 31311202739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31311333811.

It is not a weakly prime, because it can be changed into another prime (31311333821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655666905 + 15655666906.

It is an arithmetic number, because the mean of its divisors is an integer number (15655666906).

Almost surely, 2^31311333811 is an apocalyptic number.

31311333811 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311333811 is an equidigital number, since it uses as much as digits as its factorization.

31311333811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The spelling of 31311333811 in words is "thirty-one billion, three hundred eleven million, three hundred thirty-three thousand, eight hundred eleven".