18216529 has 4 divisors (see below), whose sum is σ = 19008576. Its totient is φ = 17424484.

The previous prime is 18216511. The next prime is 18216557. The reversal of 18216529 is 92561281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92561281 = 6863 ⋅13487.

It is a cyclic number.

It is not a de Polignac number, because 18216529 - 2⁹ = 18216017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18216494 and 18216503.

It is not an unprimeable number, because it can be changed into a prime (18216509) 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 in 3 ways as a sum of consecutive naturals, for example, 395989 + ... + 396034.

It is an arithmetic number, because the mean of its divisors is an integer number (4752144).

Almost surely, 2^18216529 is an apocalyptic number.

It is an amenable number.

18216529 is a deficient number, since it is larger than the sum of its proper divisors (792047).

18216529 is an equidigital number, since it uses as much as digits as its factorization.

18216529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792046.

The product of its digits is 8640, while the sum is 34.

The square root of 18216529 is about 4268.0825905786. The cubic root of 18216529 is about 263.1208175209.

The spelling of 18216529 in words is "eighteen million, two hundred sixteen thousand, five hundred twenty-nine".