20901001109 has 2 divisors, whose sum is σ = 20901001110. Its totient is φ = 20901001108.

The previous prime is 20901001103. The next prime is 20901001111. The reversal of 20901001109 is 90110010902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11173124209 + 9727876900 = 105703^2 + 98630^2 .

It is a cyclic number.

It is not a de Polignac number, because 20901001109 - 2⁸ = 20901000853 is a prime.

Together with 20901001111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20901001103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10450500554 + 10450500555.

It is an arithmetic number, because the mean of its divisors is an integer number (10450500555).

Almost surely, 2^20901001109 is an apocalyptic number.

It is an amenable number.

20901001109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20901001109 is an equidigital number, since it uses as much as digits as its factorization.

20901001109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 20901001109 in words is "twenty billion, nine hundred one million, one thousand, one hundred nine".