90963221 has 2 divisors, whose sum is σ = 90963222. Its totient is φ = 90963220.

The previous prime is 90963163. The next prime is 90963233. The reversal of 90963221 is 12236909.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90459121 + 504100 = 9511^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 90963221 - 2¹⁸ = 90701077 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 (90966221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45481610 + 45481611.

It is an arithmetic number, because the mean of its divisors is an integer number (45481611).

Almost surely, 2^90963221 is an apocalyptic number.

It is an amenable number.

90963221 is a deficient number, since it is larger than the sum of its proper divisors (1).

90963221 is an equidigital number, since it uses as much as digits as its factorization.

90963221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 90963221 is about 9537.4640759481. The cubic root of 90963221 is about 449.7335393699.

The spelling of 90963221 in words is "ninety million, nine hundred sixty-three thousand, two hundred twenty-one".