18227641 has 2 divisors, whose sum is σ = 18227642. Its totient is φ = 18227640.

The previous prime is 18227633. The next prime is 18227647. The reversal of 18227641 is 14672281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12752041 + 5475600 = 3571^2 + 2340^2 .

It is a cyclic number.

It is not a de Polignac number, because 18227641 - 2³ = 18227633 is a prime.

It is not a weakly prime, because it can be changed into another prime (18227647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9113820 + 9113821.

It is an arithmetic number, because the mean of its divisors is an integer number (9113821).

Almost surely, 2^18227641 is an apocalyptic number.

It is an amenable number.

18227641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18227641 is an equidigital number, since it uses as much as digits as its factorization.

18227641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

The square root of 18227641 is about 4269.3841476260. The cubic root of 18227641 is about 263.1743074809.

The spelling of 18227641 in words is "eighteen million, two hundred twenty-seven thousand, six hundred forty-one".