16681539 has 16 divisors (see below), whose sum is σ = 26915328. Its totient is φ = 8971392.

The previous prime is 16681523. The next prime is 16681579. The reversal of 16681539 is 93518661.

It is not a de Polignac number, because 16681539 - 2⁴ = 16681523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16681497 and 16681506.

It is not an unprimeable number, because it can be changed into a prime (16681579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23007 + ... + 23720.

It is an arithmetic number, because the mean of its divisors is an integer number (1682208).

Almost surely, 2^16681539 is an apocalyptic number.

16681539 is a deficient number, since it is larger than the sum of its proper divisors (10233789).

16681539 is a wasteful number, since it uses less digits than its factorization.

16681539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46754.

The product of its digits is 38880, while the sum is 39.

The square root of 16681539 is about 4084.3039798722. The cubic root of 16681539 is about 255.5124336049.

The spelling of 16681539 in words is "sixteen million, six hundred eighty-one thousand, five hundred thirty-nine".