90333821 has 2 divisors, whose sum is σ = 90333822. Its totient is φ = 90333820.

The previous prime is 90333791. The next prime is 90333833. The reversal of 90333821 is 12833309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57684025 + 32649796 = 7595^2 + 5714^2 .

It is an emirp because it is prime and its reverse (12833309) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90333821 - 2¹⁰ = 90332797 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 (90333851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45166910 + 45166911.

It is an arithmetic number, because the mean of its divisors is an integer number (45166911).

Almost surely, 2^90333821 is an apocalyptic number.

It is an amenable number.

90333821 is a deficient number, since it is larger than the sum of its proper divisors (1).

90333821 is an equidigital number, since it uses as much as digits as its factorization.

90333821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 90333821 is about 9504.4106077126. The cubic root of 90333821 is about 448.6938602914.

The spelling of 90333821 in words is "ninety million, three hundred thirty-three thousand, eight hundred twenty-one".