16689613 has 4 divisors (see below), whose sum is σ = 16728768. Its totient is φ = 16650460.

The previous prime is 16689611. The next prime is 16689623. The reversal of 16689613 is 31698661.

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 16689613 - 2¹ = 16689611 is a prime.

It is a super-3 number, since 3×16689613³ (a number of 23 digits) contains 333 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 (16689611) 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, 18931 + ... + 19792.

It is an arithmetic number, because the mean of its divisors is an integer number (4182192).

Almost surely, 2^16689613 is an apocalyptic number.

It is an amenable number.

16689613 is a deficient number, since it is larger than the sum of its proper divisors (39155).

16689613 is an equidigital number, since it uses as much as digits as its factorization.

16689613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39154.

The product of its digits is 46656, while the sum is 40.

The square root of 16689613 is about 4085.2922784055. The cubic root of 16689613 is about 255.5536503184.

The spelling of 16689613 in words is "sixteen million, six hundred eighty-nine thousand, six hundred thirteen".