91566851 has 2 divisors, whose sum is σ = 91566852. Its totient is φ = 91566850.

The previous prime is 91566809. The next prime is 91566877. The reversal of 91566851 is 15866519.

It is a strong prime.

It is an emirp because it is prime and its reverse (15866519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91566851 - 2¹⁰ = 91565827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91566799 and 91566808.

It is not a weakly prime, because it can be changed into another prime (91566751) 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, 45783425 + 45783426.

It is an arithmetic number, because the mean of its divisors is an integer number (45783426).

Almost surely, 2^91566851 is an apocalyptic number.

91566851 is a deficient number, since it is larger than the sum of its proper divisors (1).

91566851 is an equidigital number, since it uses as much as digits as its factorization.

91566851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The square root of 91566851 is about 9569.0569545802. The cubic root of 91566851 is about 450.7261543406.

The spelling of 91566851 in words is "ninety-one million, five hundred sixty-six thousand, eight hundred fifty-one".