18162481 has 4 divisors (see below), whose sum is σ = 18174052. Its totient is φ = 18150912.

The previous prime is 18162457. The next prime is 18162491. The reversal of 18162481 is 18426181.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1221025 + 16941456 = 1105^2 + 4116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18162481 is a prime.

It is a super-2 number, since 2×18162481² = 659751432150722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18162421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2976 + ... + 6721.

It is an arithmetic number, because the mean of its divisors is an integer number (4543513).

Almost surely, 2^18162481 is an apocalyptic number.

It is an amenable number.

18162481 is a deficient number, since it is larger than the sum of its proper divisors (11571).

18162481 is an equidigital number, since it uses as much as digits as its factorization.

18162481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11570.

The product of its digits is 3072, while the sum is 31.

The square root of 18162481 is about 4261.7462383394. The cubic root of 18162481 is about 262.8603353734.

The spelling of 18162481 in words is "eighteen million, one hundred sixty-two thousand, four hundred eighty-one".