19148989 has 2 divisors, whose sum is σ = 19148990. Its totient is φ = 19148988.

The previous prime is 19148963. The next prime is 19148993. The reversal of 19148989 is 98984191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12020089 + 7128900 = 3467^2 + 2670^2 .

It is a cyclic number.

It is not a de Polignac number, because 19148989 - 2⁷ = 19148861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19148929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9574494 + 9574495.

It is an arithmetic number, because the mean of its divisors is an integer number (9574495).

Almost surely, 2^19148989 is an apocalyptic number.

It is an amenable number.

19148989 is a deficient number, since it is larger than the sum of its proper divisors (1).

19148989 is an equidigital number, since it uses as much as digits as its factorization.

19148989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 49.

The square root of 19148989 is about 4375.9557813122. The cubic root of 19148989 is about 267.5358277339.

The spelling of 19148989 in words is "nineteen million, one hundred forty-eight thousand, nine hundred eighty-nine".