20112192809 has 2 divisors, whose sum is σ = 20112192810. Its totient is φ = 20112192808.

The previous prime is 20112192787. The next prime is 20112192817. The reversal of 20112192809 is 90829121102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10226265625 + 9885927184 = 101125^2 + 99428^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112192809 - 2³² = 15817225513 is a prime.

It is not a weakly prime, because it can be changed into another prime (20112192409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056096404 + 10056096405.

It is an arithmetic number, because the mean of its divisors is an integer number (10056096405).

Almost surely, 2^20112192809 is an apocalyptic number.

It is an amenable number.

20112192809 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112192809 is an equidigital number, since it uses as much as digits as its factorization.

20112192809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 20112192809 in words is "twenty billion, one hundred twelve million, one hundred ninety-two thousand, eight hundred nine".