90840749 has 2 divisors, whose sum is σ = 90840750. Its totient is φ = 90840748.

The previous prime is 90840733. The next prime is 90840779. The reversal of 90840749 is 94704809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72505225 + 18335524 = 8515^2 + 4282^2 .

It is an emirp because it is prime and its reverse (94704809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90840749 - 2⁴ = 90840733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90840719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45420374 + 45420375.

It is an arithmetic number, because the mean of its divisors is an integer number (45420375).

Almost surely, 2^90840749 is an apocalyptic number.

It is an amenable number.

90840749 is a deficient number, since it is larger than the sum of its proper divisors (1).

90840749 is an equidigital number, since it uses as much as digits as its factorization.

90840749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 90840749 is about 9531.0413386996. The cubic root of 90840749 is about 449.5316097564.

The spelling of 90840749 in words is "ninety million, eight hundred forty thousand, seven hundred forty-nine".