18190541 has 2 divisors, whose sum is σ = 18190542. Its totient is φ = 18190540.

The previous prime is 18190537. The next prime is 18190547. The reversal of 18190541 is 14509181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16434916 + 1755625 = 4054^2 + 1325^2 .

It is an emirp because it is prime and its reverse (14509181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18190541 - 2² = 18190537 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18190547) 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 as a sum of consecutive naturals, namely, 9095270 + 9095271.

It is an arithmetic number, because the mean of its divisors is an integer number (9095271).

Almost surely, 2^18190541 is an apocalyptic number.

It is an amenable number.

18190541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18190541 is an equidigital number, since it uses as much as digits as its factorization.

18190541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 18190541 is about 4265.0370455601. The cubic root of 18190541 is about 262.9956338097.

The spelling of 18190541 in words is "eighteen million, one hundred ninety thousand, five hundred forty-one".