99997189 has 2 divisors, whose sum is σ = 99997190. Its totient is φ = 99997188.

The previous prime is 99997187. The next prime is 99997243. The reversal of 99997189 is 98179999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99341089 + 656100 = 9967^2 + 810^2 .

It is an emirp because it is prime and its reverse (98179999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99997189 - 2¹ = 99997187 is a prime.

Together with 99997187, 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 (99997187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49998594 + 49998595.

It is an arithmetic number, because the mean of its divisors is an integer number (49998595).

Almost surely, 2^99997189 is an apocalyptic number.

It is an amenable number.

99997189 is a deficient number, since it is larger than the sum of its proper divisors (1).

99997189 is an equidigital number, since it uses as much as digits as its factorization.

99997189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3306744, while the sum is 61.

The square root of 99997189 is about 9999.8594490123. The cubic root of 99997189 is about 464.1545341518.

The spelling of 99997189 in words is "ninety-nine million, nine hundred ninety-seven thousand, one hundred eighty-nine".