91002227 has 2 divisors, whose sum is σ = 91002228. Its totient is φ = 91002226.

The previous prime is 91002221. The next prime is 91002239. The reversal of 91002227 is 72220019.

It is a weak prime.

It is an emirp because it is prime and its reverse (72220019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91002227 - 2²⁰ = 89953651 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91002221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45501113 + 45501114.

It is an arithmetic number, because the mean of its divisors is an integer number (45501114).

Almost surely, 2^91002227 is an apocalyptic number.

91002227 is a deficient number, since it is larger than the sum of its proper divisors (1).

91002227 is an equidigital number, since it uses as much as digits as its factorization.

91002227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 91002227 is about 9539.5087399719. The cubic root of 91002227 is about 449.7978136975.

The spelling of 91002227 in words is "ninety-one million, two thousand, two hundred twenty-seven".