16933681 has 4 divisors (see below), whose sum is σ = 17669952. Its totient is φ = 16197412.

The previous prime is 16933673. The next prime is 16933687. The reversal of 16933681 is 18633961.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18633961 = 373 ⋅49957.

It is a cyclic number.

It is not a de Polignac number, because 16933681 - 2³ = 16933673 is a prime.

It is a super-2 number, since 2×16933681² = 573499104419522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16933681.

It is not an unprimeable number, because it can be changed into a prime (16933687) 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, 368101 + ... + 368146.

It is an arithmetic number, because the mean of its divisors is an integer number (4417488).

Almost surely, 2^16933681 is an apocalyptic number.

It is an amenable number.

16933681 is a deficient number, since it is larger than the sum of its proper divisors (736271).

16933681 is an equidigital number, since it uses as much as digits as its factorization.

16933681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736270.

The product of its digits is 23328, while the sum is 37.

The square root of 16933681 is about 4115.0554066744. The cubic root of 16933681 is about 256.7933609257.

The spelling of 16933681 in words is "sixteen million, nine hundred thirty-three thousand, six hundred eighty-one".