16998861 has 32 divisors (see below), whose sum is σ = 26483328. Its totient is φ = 9584640.

The previous prime is 16998859. The next prime is 16998869. The reversal of 16998861 is 16889961.

It is not a de Polignac number, because 16998861 - 2¹ = 16998859 is a prime.

It is a super-2 number, since 2×16998861² = 577922550594642, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16998861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16998869) 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 31 ways as a sum of consecutive naturals, for example, 87981 + ... + 88173.

It is an arithmetic number, because the mean of its divisors is an integer number (827604).

Almost surely, 2^16998861 is an apocalyptic number.

16998861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16998861 is a deficient number, since it is larger than the sum of its proper divisors (9484467).

16998861 is a wasteful number, since it uses less digits than its factorization.

16998861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381.

The product of its digits is 186624, while the sum is 48.

The square root of 16998861 is about 4122.9674992655. The cubic root of 16998861 is about 257.1224164087.

Subtracting from 16998861 its reverse (16889961), we obtain a square (108900 = 330²).

The spelling of 16998861 in words is "sixteen million, nine hundred ninety-eight thousand, eight hundred sixty-one".