91409147 has 2 divisors, whose sum is σ = 91409148. Its totient is φ = 91409146.

The previous prime is 91409093. The next prime is 91409177. The reversal of 91409147 is 74190419.

It is a strong prime.

It is an emirp because it is prime and its reverse (74190419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91409147 - 2¹⁸ = 91147003 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91409177) 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, 45704573 + 45704574.

It is an arithmetic number, because the mean of its divisors is an integer number (45704574).

Almost surely, 2^91409147 is an apocalyptic number.

91409147 is a deficient number, since it is larger than the sum of its proper divisors (1).

91409147 is an equidigital number, since it uses as much as digits as its factorization.

91409147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 91409147 is about 9560.8130930376. The cubic root of 91409147 is about 450.4672463656.

The spelling of 91409147 in words is "ninety-one million, four hundred nine thousand, one hundred forty-seven".