18522709 has 2 divisors, whose sum is σ = 18522710. Its totient is φ = 18522708.

The previous prime is 18522689. The next prime is 18522719. The reversal of 18522709 is 90722581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12096484 + 6426225 = 3478^2 + 2535^2 .

It is an emirp because it is prime and its reverse (90722581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18522709 is a prime.

It is equal to p_1182499 and since 18522709 and 1182499 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18522719) 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, 9261354 + 9261355.

It is an arithmetic number, because the mean of its divisors is an integer number (9261355).

Almost surely, 2^18522709 is an apocalyptic number.

It is an amenable number.

18522709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18522709 is an equidigital number, since it uses as much as digits as its factorization.

18522709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 18522709 is about 4303.8016915281. The cubic root of 18522709 is about 264.5867964138.

The spelling of 18522709 in words is "eighteen million, five hundred twenty-two thousand, seven hundred nine".