91818443 has 2 divisors, whose sum is σ = 91818444. Its totient is φ = 91818442.

The previous prime is 91818427. The next prime is 91818449. The reversal of 91818443 is 34481819.

It is a strong prime.

It is an emirp because it is prime and its reverse (34481819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91818443 - 2⁴ = 91818427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91818397 and 91818406.

It is not a weakly prime, because it can be changed into another prime (91818449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45909221 + 45909222.

It is an arithmetic number, because the mean of its divisors is an integer number (45909222).

Almost surely, 2^91818443 is an apocalyptic number.

91818443 is a deficient number, since it is larger than the sum of its proper divisors (1).

91818443 is an equidigital number, since it uses as much as digits as its factorization.

91818443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 91818443 is about 9582.1940598174. The cubic root of 91818443 is about 451.1385866855.

The spelling of 91818443 in words is "ninety-one million, eight hundred eighteen thousand, four hundred forty-three".