16505313 has 16 divisors (see below), whose sum is σ = 24463296. Its totient is φ = 9813440.

The previous prime is 16505303. The next prime is 16505323. The reversal of 16505313 is 31350561.

It is an interprime number because it is at equal distance from previous prime (16505303) and next prime (16505323).

It is a cyclic number.

It is not a de Polignac number, because 16505313 - 2¹⁰ = 16504289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16505303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2970 + ... + 6467.

It is an arithmetic number, because the mean of its divisors is an integer number (1528956).

Almost surely, 2^16505313 is an apocalyptic number.

It is an amenable number.

16505313 is a deficient number, since it is larger than the sum of its proper divisors (7957983).

16505313 is a wasteful number, since it uses less digits than its factorization.

16505313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9504.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 16505313 is about 4062.6731347722. The cubic root of 16505313 is about 254.6094907033.

Adding to 16505313 its reverse (31350561), we get a palindrome (47855874).

The spelling of 16505313 in words is "sixteen million, five hundred five thousand, three hundred thirteen".