18302161 has 12 divisors (see below), whose sum is σ = 19501020. Its totient is φ = 17156160.

The previous prime is 18302159. The next prime is 18302171. The reversal of 18302161 is 16120381.

It can be written as a sum of positive squares in 6 ways, for example, as 2461761 + 15840400 = 1569^2 + 3980^2 .

It is not a de Polignac number, because 18302161 - 2¹ = 18302159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18302101) 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 in 11 ways as a sum of consecutive naturals, for example, 39471 + ... + 39931.

It is an arithmetic number, because the mean of its divisors is an integer number (1625085).

Almost surely, 2^18302161 is an apocalyptic number.

It is an amenable number.

18302161 is a deficient number, since it is larger than the sum of its proper divisors (1198859).

18302161 is an equidigital number, since it uses as much as digits as its factorization.

18302161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18302161 is about 4278.1024999408. The cubic root of 18302161 is about 263.5324647015.

The spelling of 18302161 in words is "eighteen million, three hundred two thousand, one hundred sixty-one".