16791681 has 8 divisors (see below), whose sum is σ = 22407840. Its totient is φ = 11184992.

The previous prime is 16791661. The next prime is 16791703. The reversal of 16791681 is 18619761.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16791681 is a prime.

It is a super-2 number, since 2×16791681² = 563921101611522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16791601) 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, 5821 + ... + 8213.

It is an arithmetic number, because the mean of its divisors is an integer number (2800980).

Almost surely, 2^16791681 is an apocalyptic number.

It is an amenable number.

16791681 is a deficient number, since it is larger than the sum of its proper divisors (5616159).

16791681 is a wasteful number, since it uses less digits than its factorization.

16791681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4735.

The product of its digits is 18144, while the sum is 39.

The square root of 16791681 is about 4097.7653666358. The cubic root of 16791681 is about 256.0735516604.

The spelling of 16791681 in words is "sixteen million, seven hundred ninety-one thousand, six hundred eighty-one".