91830691 has 2 divisors, whose sum is σ = 91830692. Its totient is φ = 91830690.

The previous prime is 91830653. The next prime is 91830701. The reversal of 91830691 is 19603819.

It is a strong prime.

It is an emirp because it is prime and its reverse (19603819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91830691 - 2¹³ = 91822499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91830691.

It is not a weakly prime, because it can be changed into another prime (91830391) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45915345 + 45915346.

It is an arithmetic number, because the mean of its divisors is an integer number (45915346).

Almost surely, 2^91830691 is an apocalyptic number.

91830691 is a deficient number, since it is larger than the sum of its proper divisors (1).

91830691 is an equidigital number, since it uses as much as digits as its factorization.

91830691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 91830691 is about 9582.8331405697. The cubic root of 91830691 is about 451.1586454724.

The spelling of 91830691 in words is "ninety-one million, eight hundred thirty thousand, six hundred ninety-one".