16531717 has 4 divisors (see below), whose sum is σ = 16662016. Its totient is φ = 16401420.

The previous prime is 16531709. The next prime is 16531747. The reversal of 16531717 is 71713561.

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: 71713561 = 421 ⋅170341.

It is a cyclic number.

It is not a de Polignac number, because 16531717 - 2³ = 16531709 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 (16531747) 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, 64959 + ... + 65212.

It is an arithmetic number, because the mean of its divisors is an integer number (4165504).

Almost surely, 2^16531717 is an apocalyptic number.

It is an amenable number.

16531717 is a deficient number, since it is larger than the sum of its proper divisors (130299).

16531717 is a wasteful number, since it uses less digits than its factorization.

16531717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130298.

The product of its digits is 4410, while the sum is 31.

The square root of 16531717 is about 4065.9214207852. The cubic root of 16531717 is about 254.7451869554.

The spelling of 16531717 in words is "sixteen million, five hundred thirty-one thousand, seven hundred seventeen".