91818383 has 2 divisors, whose sum is σ = 91818384. Its totient is φ = 91818382.

The previous prime is 91818371. The next prime is 91818413. The reversal of 91818383 is 38381819.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91818383 - 2²⁰ = 90769807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91818383.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91818283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45909191 + 45909192.

It is an arithmetic number, because the mean of its divisors is an integer number (45909192).

Almost surely, 2^91818383 is an apocalyptic number.

91818383 is a deficient number, since it is larger than the sum of its proper divisors (1).

91818383 is an equidigital number, since it uses as much as digits as its factorization.

91818383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 91818383 is about 9582.1909290099. The cubic root of 91818383 is about 451.1384884180.

The spelling of 91818383 in words is "ninety-one million, eight hundred eighteen thousand, three hundred eighty-three".