91856291 has 2 divisors, whose sum is σ = 91856292. Its totient is φ = 91856290.

The previous prime is 91856269. The next prime is 91856309. The reversal of 91856291 is 19265819.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19265819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91856291 - 2¹⁴ = 91839907 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (91856591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45928145 + 45928146.

It is an arithmetic number, because the mean of its divisors is an integer number (45928146).

Almost surely, 2^91856291 is an apocalyptic number.

91856291 is a deficient number, since it is larger than the sum of its proper divisors (1).

91856291 is an equidigital number, since it uses as much as digits as its factorization.

91856291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 91856291 is about 9584.1687693821. The cubic root of 91856291 is about 451.2005653292.

The spelling of 91856291 in words is "ninety-one million, eight hundred fifty-six thousand, two hundred ninety-one".