93990209 has 2 divisors, whose sum is σ = 93990210. Its totient is φ = 93990208.

The previous prime is 93990179. The next prime is 93990251. The reversal of 93990209 is 90209939.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64320400 + 29669809 = 8020^2 + 5447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-93990209 is a prime.

It is not a weakly prime, because it can be changed into another prime (93990269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46995104 + 46995105.

It is an arithmetic number, because the mean of its divisors is an integer number (46995105).

Almost surely, 2^93990209 is an apocalyptic number.

It is an amenable number.

93990209 is a deficient number, since it is larger than the sum of its proper divisors (1).

93990209 is an equidigital number, since it uses as much as digits as its factorization.

93990209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39366, while the sum is 41.

The square root of 93990209 is about 9694.8547694125. The cubic root of 93990209 is about 454.6678072796.

The spelling of 93990209 in words is "ninety-three million, nine hundred ninety thousand, two hundred nine".