19880101001 has 2 divisors, whose sum is σ = 19880101002. Its totient is φ = 19880101000.

The previous prime is 19880100997. The next prime is 19880101049. The reversal of 19880101001 is 10010108891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12387467401 + 7492633600 = 111299^2 + 86560^2 .

It is an emirp because it is prime and its reverse (10010108891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19880101001 - 2² = 19880100997 is a prime.

It is a super-2 number, since 2×19880101001² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19880101061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940050500 + 9940050501.

It is an arithmetic number, because the mean of its divisors is an integer number (9940050501).

Almost surely, 2^19880101001 is an apocalyptic number.

It is an amenable number.

19880101001 is a deficient number, since it is larger than the sum of its proper divisors (1).

19880101001 is an equidigital number, since it uses as much as digits as its factorization.

19880101001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 29.

Adding to 19880101001 its reverse (10010108891), we get a palindrome (29890209892).

The spelling of 19880101001 in words is "nineteen billion, eight hundred eighty million, one hundred one thousand, one".