211120191809 has 2 divisors, whose sum is σ = 211120191810. Its totient is φ = 211120191808.

The previous prime is 211120191767. The next prime is 211120191833. The reversal of 211120191809 is 908191021112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150063264400 + 61056927409 = 387380^2 + 247097^2 .

It is a cyclic number.

It is not a de Polignac number, because 211120191809 - 2⁸ = 211120191553 is a prime.

It is not a weakly prime, because it can be changed into another prime (211120191899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105560095904 + 105560095905.

It is an arithmetic number, because the mean of its divisors is an integer number (105560095905).

Almost surely, 2^211120191809 is an apocalyptic number.

It is an amenable number.

211120191809 is a deficient number, since it is larger than the sum of its proper divisors (1).

211120191809 is an equidigital number, since it uses as much as digits as its factorization.

211120191809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 211120191809 in words is "two hundred eleven billion, one hundred twenty million, one hundred ninety-one thousand, eight hundred nine".