19880101 has 2 divisors, whose sum is σ = 19880102. Its totient is φ = 19880100.

The previous prime is 19880059. The next prime is 19880111. The reversal of 19880101 is 10108891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19131876 + 748225 = 4374^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 19880101 - 2⁷ = 19879973 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19880101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19880111) 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, 9940050 + 9940051.

It is an arithmetic number, because the mean of its divisors is an integer number (9940051).

Almost surely, 2^19880101 is an apocalyptic number.

It is an amenable number.

19880101 is a deficient number, since it is larger than the sum of its proper divisors (1).

19880101 is an equidigital number, since it uses as much as digits as its factorization.

19880101 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 28.

The square root of 19880101 is about 4458.7106880801. The cubic root of 19880101 is about 270.8982474984.

Adding to 19880101 its reverse (10108891), we get a palindrome (29988992).

The spelling of 19880101 in words is "nineteen million, eight hundred eighty thousand, one hundred one".