19881001 has 8 divisors (see below), whose sum is σ = 22766400. Its totient is φ = 17006928.

The previous prime is 19880981. The next prime is 19881019. The reversal of 19881001 is 10018891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19881001 - 2⁷ = 19880873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19881101) 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 in 7 ways as a sum of consecutive naturals, for example, 1350 + ... + 6448.

It is an arithmetic number, because the mean of its divisors is an integer number (2845800).

Almost surely, 2^19881001 is an apocalyptic number.

It is an amenable number.

19881001 is a deficient number, since it is larger than the sum of its proper divisors (2885399).

19881001 is an equidigital number, since it uses as much as digits as its factorization.

19881001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5663.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 19881001 is about 4458.8116129749. The cubic root of 19881001 is about 270.9023354177.

Adding to 19881001 its reverse (10018891), we get a palindrome (29899892).

The spelling of 19881001 in words is "nineteen million, eight hundred eighty-one thousand, one".