18172541 has 8 divisors (see below), whose sum is σ = 19862784. Its totient is φ = 16551360.

The previous prime is 18172537. The next prime is 18172543. The reversal of 18172541 is 14527181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18172541 - 2² = 18172537 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18172543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16715 + ... + 17768.

It is an arithmetic number, because the mean of its divisors is an integer number (2482848).

Almost surely, 2^18172541 is an apocalyptic number.

It is an amenable number.

18172541 is a deficient number, since it is larger than the sum of its proper divisors (1690243).

18172541 is a wasteful number, since it uses less digits than its factorization.

18172541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34531.

The product of its digits is 2240, while the sum is 29.

The square root of 18172541 is about 4262.9263423146. The cubic root of 18172541 is about 262.9088582394.

The spelling of 18172541 in words is "eighteen million, one hundred seventy-two thousand, five hundred forty-one".