90000902009 has 2 divisors, whose sum is σ = 90000902010. Its totient is φ = 90000902008.

The previous prime is 90000901997. The next prime is 90000902063. The reversal of 90000902009 is 90020900009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46984897600 + 43016004409 = 216760^2 + 207403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90000902009 is a prime.

It is not a weakly prime, because it can be changed into another prime (90000902809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45000451004 + 45000451005.

It is an arithmetic number, because the mean of its divisors is an integer number (45000451005).

Almost surely, 2^90000902009 is an apocalyptic number.

It is an amenable number.

90000902009 is a deficient number, since it is larger than the sum of its proper divisors (1).

90000902009 is an equidigital number, since it uses as much as digits as its factorization.

90000902009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 29.

The spelling of 90000902009 in words is "ninety billion, nine hundred two thousand, nine".