91295821 has 2 divisors, whose sum is σ = 91295822. Its totient is φ = 91295820.

The previous prime is 91295791. The next prime is 91295843. The reversal of 91295821 is 12859219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47073321 + 44222500 = 6861^2 + 6650^2 .

It is a cyclic number.

It is not a de Polignac number, because 91295821 - 2¹³ = 91287629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91295881) 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, 45647910 + 45647911.

It is an arithmetic number, because the mean of its divisors is an integer number (45647911).

Almost surely, 2^91295821 is an apocalyptic number.

It is an amenable number.

91295821 is a deficient number, since it is larger than the sum of its proper divisors (1).

91295821 is an equidigital number, since it uses as much as digits as its factorization.

91295821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 91295821 is about 9554.8846670172. The cubic root of 91295821 is about 450.2810113117.

The spelling of 91295821 in words is "ninety-one million, two hundred ninety-five thousand, eight hundred twenty-one".