199121589 has 24 divisors (see below), whose sum is σ = 293217600. Its totient is φ = 130185792.

The previous prime is 199121581. The next prime is 199121651. The reversal of 199121589 is 985121991.

It is not a de Polignac number, because 199121589 - 2³ = 199121581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199121581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129982 + ... + 131504.

It is an arithmetic number, because the mean of its divisors is an integer number (12217400).

Almost surely, 2^199121589 is an apocalyptic number.

It is an amenable number.

199121589 is a deficient number, since it is larger than the sum of its proper divisors (94096011).

199121589 is a wasteful number, since it uses less digits than its factorization.

199121589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801 (or 1798 counting only the distinct ones).

The product of its digits is 58320, while the sum is 45.

The square root of 199121589 is about 14111.0449294161. The cubic root of 199121589 is about 583.9461280215.

The spelling of 199121589 in words is "one hundred ninety-nine million, one hundred twenty-one thousand, five hundred eighty-nine".