91228771 has 2 divisors, whose sum is σ = 91228772. Its totient is φ = 91228770.

The previous prime is 91228769. The next prime is 91228801. The reversal of 91228771 is 17782219.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91228771 - 2¹ = 91228769 is a prime.

Together with 91228769, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91228771.

It is not a weakly prime, because it can be changed into another prime (91228271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45614385 + 45614386.

It is an arithmetic number, because the mean of its divisors is an integer number (45614386).

Almost surely, 2^91228771 is an apocalyptic number.

91228771 is a deficient number, since it is larger than the sum of its proper divisors (1).

91228771 is an equidigital number, since it uses as much as digits as its factorization.

91228771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 37.

The square root of 91228771 is about 9551.3753459908. The cubic root of 91228771 is about 450.1707516613.

The spelling of 91228771 in words is "ninety-one million, two hundred twenty-eight thousand, seven hundred seventy-one".