9228181 has 2 divisors, whose sum is σ = 9228182. Its totient is φ = 9228180.

The previous prime is 9228169. The next prime is 9228203. The reversal of 9228181 is 1818229.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5062500 + 4165681 = 2250^2 + 2041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9228181 is a prime.

It is a super-2 number, since 2×9228181² = 170318649137522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9228151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4614090 + 4614091.

It is an arithmetic number, because the mean of its divisors is an integer number (4614091).

Almost surely, 2^9228181 is an apocalyptic number.

It is an amenable number.

9228181 is a deficient number, since it is larger than the sum of its proper divisors (1).

9228181 is an equidigital number, since it uses as much as digits as its factorization.

9228181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 31.

The square root of 9228181 is about 3037.7921258704. The cubic root of 9228181 is about 209.7516413882.

It can be divided in two parts, 9228 and 181, that added together give a square (9409 = 97²).

The spelling of 9228181 in words is "nine million, two hundred twenty-eight thousand, one hundred eighty-one".