11210985809 has 2 divisors, whose sum is σ = 11210985810. Its totient is φ = 11210985808.

The previous prime is 11210985787. The next prime is 11210985859. The reversal of 11210985809 is 90858901211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11203587409 + 7398400 = 105847^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 11210985809 - 2⁸ = 11210985553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11210985809.

It is not a weakly prime, because it can be changed into another prime (11210985859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605492904 + 5605492905.

It is an arithmetic number, because the mean of its divisors is an integer number (5605492905).

Almost surely, 2^11210985809 is an apocalyptic number.

It is an amenable number.

11210985809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11210985809 is an equidigital number, since it uses as much as digits as its factorization.

11210985809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 44.

The spelling of 11210985809 in words is "eleven billion, two hundred ten million, nine hundred eighty-five thousand, eight hundred nine".