18018941 has 2 divisors, whose sum is σ = 18018942. Its totient is φ = 18018940.

The previous prime is 18018937. The next prime is 18018943. The reversal of 18018941 is 14981081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 1331716 = 4085^2 + 1154^2 .

It is a cyclic number.

It is not a de Polignac number, because 18018941 - 2² = 18018937 is a prime.

It is a super-2 number, since 2×18018941² = 649364469522962, which contains 22 as substring.

Together with 18018943, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18018898 and 18018907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18018943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9009470 + 9009471.

It is an arithmetic number, because the mean of its divisors is an integer number (9009471).

Almost surely, 2^18018941 is an apocalyptic number.

It is an amenable number.

18018941 is a deficient number, since it is larger than the sum of its proper divisors (1).

18018941 is an equidigital number, since it uses as much as digits as its factorization.

18018941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 18018941 is about 4244.8723184567. The cubic root of 18018941 is about 262.1660321272.

The spelling of 18018941 in words is "eighteen million, eighteen thousand, nine hundred forty-one".