91004205449 has 2 divisors, whose sum is σ = 91004205450. Its totient is φ = 91004205448.

The previous prime is 91004205389. The next prime is 91004205521. The reversal of 91004205449 is 94450240019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87190278400 + 3813927049 = 295280^2 + 61757^2 .

It is an emirp because it is prime and its reverse (94450240019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91004205449 - 2³² = 86709238153 is a prime.

It is not a weakly prime, because it can be changed into another prime (91004202449) 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, 45502102724 + 45502102725.

It is an arithmetic number, because the mean of its divisors is an integer number (45502102725).

Almost surely, 2^91004205449 is an apocalyptic number.

It is an amenable number.

91004205449 is a deficient number, since it is larger than the sum of its proper divisors (1).

91004205449 is an equidigital number, since it uses as much as digits as its factorization.

91004205449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 91004205449 in words is "ninety-one billion, four million, two hundred five thousand, four hundred forty-nine".