18526009 has 2 divisors, whose sum is σ = 18526010. Its totient is φ = 18526008.

The previous prime is 18525989. The next prime is 18526033. The reversal of 18526009 is 90062581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11370384 + 7155625 = 3372^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 18526009 - 2⁹ = 18525497 is a prime.

It is not a weakly prime, because it can be changed into another prime (18526069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9263004 + 9263005.

It is an arithmetic number, because the mean of its divisors is an integer number (9263005).

Almost surely, 2^18526009 is an apocalyptic number.

It is an amenable number.

18526009 is a deficient number, since it is larger than the sum of its proper divisors (1).

18526009 is an equidigital number, since it uses as much as digits as its factorization.

18526009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 18526009 is about 4304.1850564305. The cubic root of 18526009 is about 264.6025083808.

The spelling of 18526009 in words is "eighteen million, five hundred twenty-six thousand, nine".