90549799 has 2 divisors, whose sum is σ = 90549800. Its totient is φ = 90549798.

The previous prime is 90549793. The next prime is 90549817. The reversal of 90549799 is 99794509.

It is a weak prime.

It is an emirp because it is prime and its reverse (99794509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90549799 - 2⁹ = 90549287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90549793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45274899 + 45274900.

It is an arithmetic number, because the mean of its divisors is an integer number (45274900).

Almost surely, 2^90549799 is an apocalyptic number.

90549799 is a deficient number, since it is larger than the sum of its proper divisors (1).

90549799 is an equidigital number, since it uses as much as digits as its factorization.

90549799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 918540, while the sum is 52.

The square root of 90549799 is about 9515.7658125870. The cubic root of 90549799 is about 449.0511678567.

The spelling of 90549799 in words is "ninety million, five hundred forty-nine thousand, seven hundred ninety-nine".