18013529 has 2 divisors, whose sum is σ = 18013530. Its totient is φ = 18013528.

The previous prime is 18013507. The next prime is 18013537. The reversal of 18013529 is 92531081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15366400 + 2647129 = 3920^2 + 1627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18013529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18013559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9006764 + 9006765.

It is an arithmetic number, because the mean of its divisors is an integer number (9006765).

Almost surely, 2^18013529 is an apocalyptic number.

It is an amenable number.

18013529 is a deficient number, since it is larger than the sum of its proper divisors (1).

18013529 is an equidigital number, since it uses as much as digits as its factorization.

18013529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 18013529 is about 4244.2347955786. The cubic root of 18013529 is about 262.1397822560.

The spelling of 18013529 in words is "eighteen million, thirteen thousand, five hundred twenty-nine".