20010091001 has 2 divisors, whose sum is σ = 20010091002. Its totient is φ = 20010091000.

The previous prime is 20010090929. The next prime is 20010091007. The reversal of 20010091001 is 10019001002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18512323600 + 1497767401 = 136060^2 + 38701^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010091001 - 2¹⁰ = 20010089977 is a prime.

It is not a weakly prime, because it can be changed into another prime (20010091007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005045500 + 10005045501.

It is an arithmetic number, because the mean of its divisors is an integer number (10005045501).

Almost surely, 2^20010091001 is an apocalyptic number.

It is an amenable number.

20010091001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010091001 is an equidigital number, since it uses as much as digits as its factorization.

20010091001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 20010091001 its reverse (10019001002), we get a palindrome (30029092003).

The spelling of 20010091001 in words is "twenty billion, ten million, ninety-one thousand, one".