16508013 has 4 divisors (see below), whose sum is σ = 22010688. Its totient is φ = 11005340.

The previous prime is 16507999. The next prime is 16508029. The reversal of 16508013 is 31080561.

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 16508013 - 2¹⁸ = 16245869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16508083) 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, 2751333 + ... + 2751338.

It is an arithmetic number, because the mean of its divisors is an integer number (5502672).

Almost surely, 2^16508013 is an apocalyptic number.

It is an amenable number.

16508013 is a deficient number, since it is larger than the sum of its proper divisors (5502675).

16508013 is an equidigital number, since it uses as much as digits as its factorization.

16508013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5502674.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 16508013 is about 4063.0054147146. The cubic root of 16508013 is about 254.6233732664.

Adding to 16508013 its reverse (31080561), we get a palindrome (47588574).

The spelling of 16508013 in words is "sixteen million, five hundred eight thousand, thirteen".