18172271 has 8 divisors (see below), whose sum is σ = 19773264. Its totient is φ = 16600320.

The previous prime is 18172261. The next prime is 18172283. The reversal of 18172271 is 17227181.

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 18172271 - 2¹⁰ = 18171247 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 (18172261) 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, 5945 + ... + 8466.

It is an arithmetic number, because the mean of its divisors is an integer number (2471658).

Almost surely, 2^18172271 is an apocalyptic number.

18172271 is a deficient number, since it is larger than the sum of its proper divisors (1600993).

18172271 is a wasteful number, since it uses less digits than its factorization.

18172271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14521.

The product of its digits is 1568, while the sum is 29.

The square root of 18172271 is about 4262.8946738103. The cubic root of 18172271 is about 262.9075561697.

The spelling of 18172271 in words is "eighteen million, one hundred seventy-two thousand, two hundred seventy-one".