91224317 has 2 divisors, whose sum is σ = 91224318. Its totient is φ = 91224316.

The previous prime is 91224283. The next prime is 91224323. The reversal of 91224317 is 71342219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72267001 + 18957316 = 8501^2 + 4354^2 .

It is a cyclic number.

It is not a de Polignac number, because 91224317 - 2⁶ = 91224253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91224317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91224337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45612158 + 45612159.

It is an arithmetic number, because the mean of its divisors is an integer number (45612159).

Almost surely, 2^91224317 is an apocalyptic number.

It is an amenable number.

91224317 is a deficient number, since it is larger than the sum of its proper divisors (1).

91224317 is an equidigital number, since it uses as much as digits as its factorization.

91224317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 91224317 is about 9551.1421830062. The cubic root of 91224317 is about 450.1634254157.

The spelling of 91224317 in words is "ninety-one million, two hundred twenty-four thousand, three hundred seventeen".