91224361 has 2 divisors, whose sum is σ = 91224362. Its totient is φ = 91224360.

The previous prime is 91224349. The next prime is 91224383. The reversal of 91224361 is 16342219.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90839961 + 384400 = 9531^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 91224361 - 2⁹ = 91223849 is a prime.

It is not a weakly prime, because it can be changed into another prime (91224391) 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, 45612180 + 45612181.

It is an arithmetic number, because the mean of its divisors is an integer number (45612181).

Almost surely, 2^91224361 is an apocalyptic number.

It is an amenable number.

91224361 is a deficient number, since it is larger than the sum of its proper divisors (1).

91224361 is an equidigital number, since it uses as much as digits as its factorization.

91224361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 91224361 is about 9551.1444863953. The cubic root of 91224361 is about 450.1634977911.

The spelling of 91224361 in words is "ninety-one million, two hundred twenty-four thousand, three hundred sixty-one".