91807643 has 2 divisors, whose sum is σ = 91807644. Its totient is φ = 91807642.

The previous prime is 91807627. The next prime is 91807679. The reversal of 91807643 is 34670819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91807643 - 2⁴ = 91807627 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 91807597 and 91807606.

It is not a weakly prime, because it can be changed into another prime (91807603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45903821 + 45903822.

It is an arithmetic number, because the mean of its divisors is an integer number (45903822).

Almost surely, 2^91807643 is an apocalyptic number.

91807643 is a deficient number, since it is larger than the sum of its proper divisors (1).

91807643 is an equidigital number, since it uses as much as digits as its factorization.

91807643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 91807643 is about 9581.6304979894. The cubic root of 91807643 is about 451.1208978363.

The spelling of 91807643 in words is "ninety-one million, eight hundred seven thousand, six hundred forty-three".