99420109 has 2 divisors, whose sum is σ = 99420110. Its totient is φ = 99420108.

The previous prime is 99420089. The next prime is 99420127. The reversal of 99420109 is 90102499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78057225 + 21362884 = 8835^2 + 4622^2 .

It is a cyclic number.

It is not a de Polignac number, because 99420109 - 2⁵ = 99420077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99420509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49710054 + 49710055.

It is an arithmetic number, because the mean of its divisors is an integer number (49710055).

Almost surely, 2^99420109 is an apocalyptic number.

It is an amenable number.

99420109 is a deficient number, since it is larger than the sum of its proper divisors (1).

99420109 is an equidigital number, since it uses as much as digits as its factorization.

99420109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 99420109 is about 9970.9632934837. The cubic root of 99420109 is about 463.2599382849.

The spelling of 99420109 in words is "ninety-nine million, four hundred twenty thousand, one hundred nine".