91605149 has 2 divisors, whose sum is σ = 91605150. Its totient is φ = 91605148.

The previous prime is 91605139. The next prime is 91605181. The reversal of 91605149 is 94150619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90060100 + 1545049 = 9490^2 + 1243^2 .

It is an emirp because it is prime and its reverse (94150619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91605149 - 2⁴ = 91605133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91605109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45802574 + 45802575.

It is an arithmetic number, because the mean of its divisors is an integer number (45802575).

Almost surely, 2^91605149 is an apocalyptic number.

It is an amenable number.

91605149 is a deficient number, since it is larger than the sum of its proper divisors (1).

91605149 is an equidigital number, since it uses as much as digits as its factorization.

91605149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 91605149 is about 9571.0578830138. The cubic root of 91605149 is about 450.7889845899.

The spelling of 91605149 in words is "ninety-one million, six hundred five thousand, one hundred forty-nine".