311233109989 has 2 divisors, whose sum is σ = 311233109990. Its totient is φ = 311233109988.

The previous prime is 311233109987. The next prime is 311233110007. The reversal of 311233109989 is 989901332113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234812930625 + 76420179364 = 484575^2 + 276442^2 .

It is a cyclic number.

It is not a de Polignac number, because 311233109989 - 2¹ = 311233109987 is a prime.

Together with 311233109987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311233109987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155616554994 + 155616554995.

It is an arithmetic number, because the mean of its divisors is an integer number (155616554995).

Almost surely, 2^311233109989 is an apocalyptic number.

It is an amenable number.

311233109989 is a deficient number, since it is larger than the sum of its proper divisors (1).

311233109989 is an equidigital number, since it uses as much as digits as its factorization.

311233109989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 49.

The spelling of 311233109989 in words is "three hundred eleven billion, two hundred thirty-three million, one hundred nine thousand, nine hundred eighty-nine".