18613081 has 8 divisors (see below), whose sum is σ = 19100160. Its totient is φ = 18129888.

The previous prime is 18613061. The next prime is 18613087. The reversal of 18613081 is 18031681.

It is a happy number.

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 18613081 - 2¹³ = 18604889 is a prime.

It is a super-2 number, since 2×18613081² = 692893568625122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18613087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10405 + ... + 12061.

It is an arithmetic number, because the mean of its divisors is an integer number (2387520).

Almost surely, 2^18613081 is an apocalyptic number.

It is an amenable number.

18613081 is a deficient number, since it is larger than the sum of its proper divisors (487079).

18613081 is a wasteful number, since it uses less digits than its factorization.

18613081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18613081 is about 4314.2880061489. The cubic root of 18613081 is about 265.0164033990.

The spelling of 18613081 in words is "eighteen million, six hundred thirteen thousand, eighty-one".