16218881 has 8 divisors (see below), whose sum is σ = 18582144. Its totient is φ = 13867200.

The previous prime is 16218877. The next prime is 16218899. The reversal of 16218881 is 18881261.

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 16218881 - 2² = 16218877 is a prime.

It is a super-2 number, since 2×16218881² = 526104201784322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16218871) 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, 356 + ... + 5706.

It is an arithmetic number, because the mean of its divisors is an integer number (2322768).

Almost surely, 2^16218881 is an apocalyptic number.

It is an amenable number.

16218881 is a deficient number, since it is larger than the sum of its proper divisors (2363263).

16218881 is an equidigital number, since it uses as much as digits as its factorization.

16218881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791.

The product of its digits is 6144, while the sum is 35.

The square root of 16218881 is about 4027.2671875603. The cubic root of 16218881 is about 253.1280629818.

The spelling of 16218881 in words is "sixteen million, two hundred eighteen thousand, eight hundred eighty-one".