20201100091 has 2 divisors, whose sum is σ = 20201100092. Its totient is φ = 20201100090.

The previous prime is 20201100079. The next prime is 20201100107. The reversal of 20201100091 is 19000110202.

It is an a-pointer prime, because the next prime (20201100107) can be obtained adding 20201100091 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201100091 - 2¹³ = 20201091899 is a prime.

It is not a weakly prime, because it can be changed into another prime (20201100071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100550045 + 10100550046.

It is an arithmetic number, because the mean of its divisors is an integer number (10100550046).

Almost surely, 2^20201100091 is an apocalyptic number.

20201100091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201100091 is an equidigital number, since it uses as much as digits as its factorization.

20201100091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20201100091 its reverse (19000110202), we get a palindrome (39201210293).

The spelling of 20201100091 in words is "twenty billion, two hundred one million, one hundred thousand, ninety-one".