18361243 has 2 divisors, whose sum is σ = 18361244. Its totient is φ = 18361242.

The previous prime is 18361229. The next prime is 18361247. The reversal of 18361243 is 34216381.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18361243 is a prime.

It is equal to p_1172908 and since 18361243 and 1172908 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18361247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9180621 + 9180622.

It is an arithmetic number, because the mean of its divisors is an integer number (9180622).

Almost surely, 2^18361243 is an apocalyptic number.

18361243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18361243 is an equidigital number, since it uses as much as digits as its factorization.

18361243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 18361243 is about 4285.0021003495. The cubic root of 18361243 is about 263.8157336366.

The spelling of 18361243 in words is "eighteen million, three hundred sixty-one thousand, two hundred forty-three".