16689071 has 4 divisors (see below), whose sum is σ = 19073232. Its totient is φ = 14304912.

The previous prime is 16689061. The next prime is 16689073. The reversal of 16689071 is 17098661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17098661 = 29 ⋅589609.

It is a cyclic number.

It is not a de Polignac number, because 16689071 - 2¹⁰ = 16688047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16689073) 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, 1192070 + ... + 1192083.

It is an arithmetic number, because the mean of its divisors is an integer number (4768308).

Almost surely, 2^16689071 is an apocalyptic number.

16689071 is a deficient number, since it is larger than the sum of its proper divisors (2384161).

16689071 is an equidigital number, since it uses as much as digits as its factorization.

16689071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384160.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 16689071 is about 4085.2259423439. The cubic root of 16689071 is about 255.5508838956.

The spelling of 16689071 in words is "sixteen million, six hundred eighty-nine thousand, seventy-one".