19169989 has 2 divisors, whose sum is σ = 19169990. Its totient is φ = 19169988.

The previous prime is 19169987. The next prime is 19170007. The reversal of 19169989 is 98996191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10349089 + 8820900 = 3217^2 + 2970^2 .

It is a cyclic number.

It is not a de Polignac number, because 19169989 - 2¹ = 19169987 is a prime.

Together with 19169987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19169981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9584994 + 9584995.

It is an arithmetic number, because the mean of its divisors is an integer number (9584995).

Almost surely, 2^19169989 is an apocalyptic number.

It is an amenable number.

19169989 is a deficient number, since it is larger than the sum of its proper divisors (1).

19169989 is an equidigital number, since it uses as much as digits as its factorization.

19169989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 52.

The square root of 19169989 is about 4378.3545996184. The cubic root of 19169989 is about 267.6335909431.

The spelling of 19169989 in words is "nineteen million, one hundred sixty-nine thousand, nine hundred eighty-nine".