16683981 has 8 divisors (see below), whose sum is σ = 22351584. Its totient is φ = 11069520.

The previous prime is 16683971. The next prime is 16683991. The reversal of 16683981 is 18938661.

It is an interprime number because it is at equal distance from previous prime (16683971) and next prime (16683991).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16683981 - 2⁵ = 16683949 is a prime.

It is a super-2 number, since 2×16683981² = 556710444016722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16683941) 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, 12546 + ... + 13811.

It is an arithmetic number, because the mean of its divisors is an integer number (2793948).

Almost surely, 2^16683981 is an apocalyptic number.

It is an amenable number.

16683981 is a deficient number, since it is larger than the sum of its proper divisors (5667603).

16683981 is a wasteful number, since it uses less digits than its factorization.

16683981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26571.

The product of its digits is 62208, while the sum is 42.

The square root of 16683981 is about 4084.6029182774. The cubic root of 16683981 is about 255.5249010980.

The spelling of 16683981 in words is "sixteen million, six hundred eighty-three thousand, nine hundred eighty-one".