91204081 has 2 divisors, whose sum is σ = 91204082. Its totient is φ = 91204080.

The previous prime is 91204063. The next prime is 91204097. The reversal of 91204081 is 18040219.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85840225 + 5363856 = 9265^2 + 2316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91204081 is a prime.

It is a super-2 number, since 2×91204081² = 16636368782109122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91204021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45602040 + 45602041.

It is an arithmetic number, because the mean of its divisors is an integer number (45602041).

Almost surely, 2^91204081 is an apocalyptic number.

It is an amenable number.

91204081 is a deficient number, since it is larger than the sum of its proper divisors (1).

91204081 is an equidigital number, since it uses as much as digits as its factorization.

91204081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 91204081 is about 9550.0827745104. The cubic root of 91204081 is about 450.1301368473.

The spelling of 91204081 in words is "ninety-one million, two hundred four thousand, eighty-one".