18226249 has 2 divisors, whose sum is σ = 18226250. Its totient is φ = 18226248.

The previous prime is 18226207. The next prime is 18226259. The reversal of 18226249 is 94262281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10936249 + 7290000 = 3307^2 + 2700^2 .

It is an emirp because it is prime and its reverse (94262281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18226249 - 2⁷ = 18226121 is a prime.

It is a super-2 number, since 2×18226249² = 664392305220002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18226259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9113124 + 9113125.

It is an arithmetic number, because the mean of its divisors is an integer number (9113125).

Almost surely, 2^18226249 is an apocalyptic number.

It is an amenable number.

18226249 is a deficient number, since it is larger than the sum of its proper divisors (1).

18226249 is an equidigital number, since it uses as much as digits as its factorization.

18226249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 18226249 is about 4269.2211233432. The cubic root of 18226249 is about 263.1676079860.

The spelling of 18226249 in words is "eighteen million, two hundred twenty-six thousand, two hundred forty-nine".