18671081 has 16 divisors (see below), whose sum is σ = 22317120. Its totient is φ = 15395520.

The previous prime is 18671071. The next prime is 18671111. The reversal of 18671081 is 18017681.

It is a cyclic number.

It is not a de Polignac number, because 18671081 - 2¹⁸ = 18408937 is a prime.

It is a super-2 number, since 2×18671081² = 697218531417122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18671011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7331 + ... + 9543.

It is an arithmetic number, because the mean of its divisors is an integer number (1394820).

Almost surely, 2^18671081 is an apocalyptic number.

18671081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18671081 is a deficient number, since it is larger than the sum of its proper divisors (3646039).

18671081 is a wasteful number, since it uses less digits than its factorization.

18671081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296.

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 18671081 is about 4321.0046285557. The cubic root of 18671081 is about 265.2913894555.

The spelling of 18671081 in words is "eighteen million, six hundred seventy-one thousand, eighty-one".