99920189 has 2 divisors, whose sum is σ = 99920190. Its totient is φ = 99920188.

The previous prime is 99920159. The next prime is 99920207. The reversal of 99920189 is 98102999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99900025 + 20164 = 9995^2 + 142^2 .

It is an emirp because it is prime and its reverse (98102999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99920189 - 2²⁴ = 83142973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99920159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49960094 + 49960095.

It is an arithmetic number, because the mean of its divisors is an integer number (49960095).

Almost surely, 2^99920189 is an apocalyptic number.

It is an amenable number.

99920189 is a deficient number, since it is larger than the sum of its proper divisors (1).

99920189 is an equidigital number, since it uses as much as digits as its factorization.

99920189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 99920189 is about 9996.0086534576. The cubic root of 99920189 is about 464.0353672135.

The spelling of 99920189 in words is "ninety-nine million, nine hundred twenty thousand, one hundred eighty-nine".