90000109 has 2 divisors, whose sum is σ = 90000110. Its totient is φ = 90000108.

The previous prime is 90000107. The next prime is 90000121. The reversal of 90000109 is 90100009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82410084 + 7590025 = 9078^2 + 2755^2 .

It is an emirp because it is prime and its reverse (90100009) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90000109 - 2¹ = 90000107 is a prime.

Together with 90000107, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90000103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45000054 + 45000055.

It is an arithmetic number, because the mean of its divisors is an integer number (45000055).

Almost surely, 2^90000109 is an apocalyptic number.

It is an amenable number.

90000109 is a deficient number, since it is larger than the sum of its proper divisors (1).

90000109 is an equidigital number, since it uses as much as digits as its factorization.

90000109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 90000109 is about 9486.8387253078. The cubic root of 90000109 is about 448.1406555716.

It can be divided in two parts, 90000 and 109, that added together give a palindrome (90109).

The spelling of 90000109 in words is "ninety million, one hundred nine", and thus it is an aban number.