90549140909 has 2 divisors, whose sum is σ = 90549140910. Its totient is φ = 90549140908.

The previous prime is 90549140897. The next prime is 90549140971. The reversal of 90549140909 is 90904194509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89835075625 + 714065284 = 299725^2 + 26722^2 .

It is a cyclic number.

It is not a de Polignac number, because 90549140909 - 2⁴ = 90549140893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90549140609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45274570454 + 45274570455.

It is an arithmetic number, because the mean of its divisors is an integer number (45274570455).

Almost surely, 2^90549140909 is an apocalyptic number.

It is an amenable number.

90549140909 is a deficient number, since it is larger than the sum of its proper divisors (1).

90549140909 is an equidigital number, since it uses as much as digits as its factorization.

90549140909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 90549140909 in words is "ninety billion, five hundred forty-nine million, one hundred forty thousand, nine hundred nine".