18042361 has 2 divisors, whose sum is σ = 18042362. Its totient is φ = 18042360.

The previous prime is 18042331. The next prime is 18042463. The reversal of 18042361 is 16324081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9954025 + 8088336 = 3155^2 + 2844^2 .

It is a cyclic number.

It is not a de Polignac number, because 18042361 - 2⁵ = 18042329 is a prime.

It is not a weakly prime, because it can be changed into another prime (18042331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9021180 + 9021181.

It is an arithmetic number, because the mean of its divisors is an integer number (9021181).

Almost surely, 2^18042361 is an apocalyptic number.

It is an amenable number.

18042361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18042361 is an equidigital number, since it uses as much as digits as its factorization.

18042361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 18042361 is about 4247.6300450957. The cubic root of 18042361 is about 262.2795658116.

The spelling of 18042361 in words is "eighteen million, forty-two thousand, three hundred sixty-one".