18518071 has 8 divisors (see below), whose sum is σ = 21755664. Its totient is φ = 15539520.

The previous prime is 18518069. The next prime is 18518081. The reversal of 18518071 is 17081581.

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 18518071 - 2¹ = 18518069 is a prime.

It is a super-2 number, since 2×18518071² = 685837907122082, 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 (18518051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64606 + ... + 64891.

It is an arithmetic number, because the mean of its divisors is an integer number (2719458).

Almost surely, 2^18518071 is an apocalyptic number.

18518071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18518071 is a deficient number, since it is larger than the sum of its proper divisors (3237593).

18518071 is a wasteful number, since it uses less digits than its factorization.

18518071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129521.

The product of its (nonzero) digits is 2240, while the sum is 31.

The square root of 18518071 is about 4303.2628318521. The cubic root of 18518071 is about 264.5647108034.

The spelling of 18518071 in words is "eighteen million, five hundred eighteen thousand, seventy-one".