91538243 has 2 divisors, whose sum is σ = 91538244. Its totient is φ = 91538242.

The previous prime is 91538231. The next prime is 91538347. The reversal of 91538243 is 34283519.

It is a weak prime.

It is an emirp because it is prime and its reverse (34283519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91538243 - 2⁸ = 91537987 is a prime.

It is not a weakly prime, because it can be changed into another prime (91538203) 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, 45769121 + 45769122.

It is an arithmetic number, because the mean of its divisors is an integer number (45769122).

Almost surely, 2^91538243 is an apocalyptic number.

91538243 is a deficient number, since it is larger than the sum of its proper divisors (1).

91538243 is an equidigital number, since it uses as much as digits as its factorization.

91538243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 91538243 is about 9567.5620196579. The cubic root of 91538243 is about 450.6792097067.

The spelling of 91538243 in words is "ninety-one million, five hundred thirty-eight thousand, two hundred forty-three".