16589681 has 4 divisors (see below), whose sum is σ = 17124864. Its totient is φ = 16054500.

The previous prime is 16589663. The next prime is 16589737. The reversal of 16589681 is 18698561.

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 a de Polignac number, because none of the positive numbers 2^k-16589681 is a prime.

It is a super-2 number, since 2×16589681² = 550435031363522, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (16589611) 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, 267545 + ... + 267606.

It is an arithmetic number, because the mean of its divisors is an integer number (4281216).

Almost surely, 2^16589681 is an apocalyptic number.

It is an amenable number.

16589681 is a deficient number, since it is larger than the sum of its proper divisors (535183).

16589681 is an equidigital number, since it uses as much as digits as its factorization.

16589681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535182.

The product of its digits is 103680, while the sum is 44.

The square root of 16589681 is about 4073.0432111629. The cubic root of 16589681 is about 255.0425713879.

The spelling of 16589681 in words is "sixteen million, five hundred eighty-nine thousand, six hundred eighty-one".