18199541 has 4 divisors (see below), whose sum is σ = 18209772. Its totient is φ = 18189312.

The previous prime is 18199529. The next prime is 18199561. The reversal of 18199541 is 14599181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14599181 = 23 ⋅634747.

It can be written as a sum of positive squares in 2 ways, for example, as 13293316 + 4906225 = 3646^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 18199541 - 2⁶ = 18199477 is a prime.

It is a super-2 number, since 2×18199541² = 662446585221362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18199495 and 18199504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18199561) 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, 1676 + ... + 6261.

It is an arithmetic number, because the mean of its divisors is an integer number (4552443).

Almost surely, 2^18199541 is an apocalyptic number.

It is an amenable number.

18199541 is a deficient number, since it is larger than the sum of its proper divisors (10231).

18199541 is an equidigital number, since it uses as much as digits as its factorization.

18199541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10230.

The product of its digits is 12960, while the sum is 38.

The square root of 18199541 is about 4266.0920055714. The cubic root of 18199541 is about 263.0390001295.

The spelling of 18199541 in words is "eighteen million, one hundred ninety-nine thousand, five hundred forty-one".