1989197099 has 4 divisors (see below), whose sum is σ = 1989320736. Its totient is φ = 1989073464.

The previous prime is 1989197083. The next prime is 1989197137. The reversal of 1989197099 is 9907919891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1989197099 - 2⁴ = 1989197083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989197299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33299 + ... + 71324.

It is an arithmetic number, because the mean of its divisors is an integer number (497330184).

Almost surely, 2^1989197099 is an apocalyptic number.

1989197099 is a deficient number, since it is larger than the sum of its proper divisors (123637).

1989197099 is a wasteful number, since it uses less digits than its factorization.

1989197099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123636.

The product of its (nonzero) digits is 3306744, while the sum is 62.

The square root of 1989197099 is about 44600.4159061325. The cubic root of 1989197099 is about 1257.6484861951.

The spelling of 1989197099 in words is "one billion, nine hundred eighty-nine million, one hundred ninety-seven thousand, ninety-nine".