18343609 has 2 divisors, whose sum is σ = 18343610. Its totient is φ = 18343608.

The previous prime is 18343571. The next prime is 18343613. The reversal of 18343609 is 90634381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12924025 + 5419584 = 3595^2 + 2328^2 .

It is a cyclic number.

It is not a de Polignac number, because 18343609 - 2¹⁵ = 18310841 is a prime.

It is a super-2 number, since 2×18343609² = 672975982289762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18343639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9171804 + 9171805.

It is an arithmetic number, because the mean of its divisors is an integer number (9171805).

Almost surely, 2^18343609 is an apocalyptic number.

It is an amenable number.

18343609 is a deficient number, since it is larger than the sum of its proper divisors (1).

18343609 is an equidigital number, since it uses as much as digits as its factorization.

18343609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 18343609 is about 4282.9439641443. The cubic root of 18343609 is about 263.7312510350.

The spelling of 18343609 in words is "eighteen million, three hundred forty-three thousand, six hundred nine".