209111319023 has 2 divisors, whose sum is σ = 209111319024. Its totient is φ = 209111319022.

The previous prime is 209111318963. The next prime is 209111319049. The reversal of 209111319023 is 320913111902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209111319023 - 2¹⁴ = 209111302639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209111319073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104555659511 + 104555659512.

It is an arithmetic number, because the mean of its divisors is an integer number (104555659512).

Almost surely, 2^209111319023 is an apocalyptic number.

209111319023 is a deficient number, since it is larger than the sum of its proper divisors (1).

209111319023 is an equidigital number, since it uses as much as digits as its factorization.

209111319023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 209111319023 in words is "two hundred nine billion, one hundred eleven million, three hundred nineteen thousand, twenty-three".