16814981 has 4 divisors (see below), whose sum is σ = 17700000. Its totient is φ = 15929964.

The previous prime is 16814971. The next prime is 16814999. The reversal of 16814981 is 18941861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16814981 - 2²² = 12620677 is a prime.

It is a super-2 number, since 2×16814981² = 565487172060722, 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 (16814971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442481 + ... + 442518.

It is an arithmetic number, because the mean of its divisors is an integer number (4425000).

Almost surely, 2^16814981 is an apocalyptic number.

It is an amenable number.

16814981 is a deficient number, since it is larger than the sum of its proper divisors (885019).

16814981 is an equidigital number, since it uses as much as digits as its factorization.

16814981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885018.

The product of its digits is 13824, while the sum is 38.

The square root of 16814981 is about 4100.6073940332. The cubic root of 16814981 is about 256.1919387788.

The spelling of 16814981 in words is "sixteen million, eight hundred fourteen thousand, nine hundred eighty-one".