91304387 has 2 divisors, whose sum is σ = 91304388. Its totient is φ = 91304386.

The previous prime is 91304377. The next prime is 91304429. The reversal of 91304387 is 78340319.

It is a weak prime.

It is an emirp because it is prime and its reverse (78340319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91304387 - 2⁴ = 91304371 is a prime.

It is not a weakly prime, because it can be changed into another prime (91304377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45652193 + 45652194.

It is an arithmetic number, because the mean of its divisors is an integer number (45652194).

Almost surely, 2^91304387 is an apocalyptic number.

91304387 is a deficient number, since it is larger than the sum of its proper divisors (1).

91304387 is an equidigital number, since it uses as much as digits as its factorization.

91304387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 91304387 is about 9555.3329089048. The cubic root of 91304387 is about 450.2950936888.

The spelling of 91304387 in words is "ninety-one million, three hundred four thousand, three hundred eighty-seven".