19881193 has 2 divisors, whose sum is σ = 19881194. Its totient is φ = 19881192.

The previous prime is 19881167. The next prime is 19881227. The reversal of 19881193 is 39118891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19829209 + 51984 = 4453^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 19881193 - 2⁵ = 19881161 is a prime.

It is not a weakly prime, because it can be changed into another prime (19881133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940596 + 9940597.

It is an arithmetic number, because the mean of its divisors is an integer number (9940597).

Almost surely, 2^19881193 is an apocalyptic number.

It is an amenable number.

19881193 is a deficient number, since it is larger than the sum of its proper divisors (1).

19881193 is an equidigital number, since it uses as much as digits as its factorization.

19881193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 40.

The square root of 19881193 is about 4458.8331433235. The cubic root of 19881193 is about 270.9032074912.

The spelling of 19881193 in words is "nineteen million, eight hundred eighty-one thousand, one hundred ninety-three".