90221402849 has 2 divisors, whose sum is σ = 90221402850. Its totient is φ = 90221402848.

The previous prime is 90221402833. The next prime is 90221402881. The reversal of 90221402849 is 94820412209.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84085500625 + 6135902224 = 289975^2 + 78332^2 .

It is a cyclic number.

It is not a de Polignac number, because 90221402849 - 2⁴ = 90221402833 is a prime.

It is not a weakly prime, because it can be changed into another prime (90221402819) 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, 45110701424 + 45110701425.

It is an arithmetic number, because the mean of its divisors is an integer number (45110701425).

Almost surely, 2^90221402849 is an apocalyptic number.

It is an amenable number.

90221402849 is a deficient number, since it is larger than the sum of its proper divisors (1).

90221402849 is an equidigital number, since it uses as much as digits as its factorization.

90221402849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 90221402849 in words is "ninety billion, two hundred twenty-one million, four hundred two thousand, eight hundred forty-nine".