16604131 has 4 divisors (see below), whose sum is σ = 16838064. Its totient is φ = 16370200.

The previous prime is 16604123. The next prime is 16604167. The reversal of 16604131 is 13140661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16604131 - 2³ = 16604123 is a prime.

It is a super-2 number, since 2×16604131² = 551394332530322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16604101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116860 + ... + 117001.

It is an arithmetic number, because the mean of its divisors is an integer number (4209516).

Almost surely, 2^16604131 is an apocalyptic number.

16604131 is a deficient number, since it is larger than the sum of its proper divisors (233933).

16604131 is an equidigital number, since it uses as much as digits as its factorization.

16604131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233932.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 16604131 is about 4074.8166829932. The cubic root of 16604131 is about 255.1165992462.

Adding to 16604131 its reverse (13140661), we get a palindrome (29744792).

The spelling of 16604131 in words is "sixteen million, six hundred four thousand, one hundred thirty-one".