16531249 has 4 divisors (see below), whose sum is σ = 18892864. Its totient is φ = 14169636.

The previous prime is 16531231. The next prime is 16531261. The reversal of 16531249 is 94213561.

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 16531249 - 2⁹ = 16530737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16531249.

It is not an unprimeable number, because it can be changed into a prime (16531219) 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, 1180797 + ... + 1180810.

It is an arithmetic number, because the mean of its divisors is an integer number (4723216).

Almost surely, 2^16531249 is an apocalyptic number.

It is an amenable number.

16531249 is a deficient number, since it is larger than the sum of its proper divisors (2361615).

16531249 is an equidigital number, since it uses as much as digits as its factorization.

16531249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361614.

The product of its digits is 6480, while the sum is 31.

The square root of 16531249 is about 4065.8638688476. The cubic root of 16531249 is about 254.7427830537.

The spelling of 16531249 in words is "sixteen million, five hundred thirty-one thousand, two hundred forty-nine".