18055319 has 4 divisors (see below), whose sum is σ = 18070920. Its totient is φ = 18039720.

The previous prime is 18055291. The next prime is 18055327. The reversal of 18055319 is 91355081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91355081 = 1187 ⋅76963.

It is a cyclic number.

It is not a de Polignac number, because 18055319 - 2¹² = 18051223 is a prime.

It is a super-2 number, since 2×18055319² = 651989088383522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055019) 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, 5912 + ... + 8429.

It is an arithmetic number, because the mean of its divisors is an integer number (4517730).

Almost surely, 2^18055319 is an apocalyptic number.

18055319 is a deficient number, since it is larger than the sum of its proper divisors (15601).

18055319 is a wasteful number, since it uses less digits than its factorization.

18055319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15600.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 18055319 is about 4249.1550924860. The cubic root of 18055319 is about 262.3423403991.

The spelling of 18055319 in words is "eighteen million, fifty-five thousand, three hundred nineteen".