18081371 has 24 divisors (see below), whose sum is σ = 23261184. Its totient is φ = 13653360.

The previous prime is 18081367. The next prime is 18081377. The reversal of 18081371 is 17318081.

It is not a de Polignac number, because 18081371 - 2² = 18081367 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 (18081377) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142310 + ... + 142436.

It is an arithmetic number, because the mean of its divisors is an integer number (969216).

Almost surely, 2^18081371 is an apocalyptic number.

18081371 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18081371 is a deficient number, since it is larger than the sum of its proper divisors (5179813).

18081371 is a wasteful number, since it uses less digits than its factorization.

18081371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 18081371 is about 4252.2195380766. The cubic root of 18081371 is about 262.4684575856.

The spelling of 18081371 in words is "eighteen million, eighty-one thousand, three hundred seventy-one".