16509013 has 4 divisors (see below), whose sum is σ = 16635168. Its totient is φ = 16382860.

The previous prime is 16509011. The next prime is 16509037. The reversal of 16509013 is 31090561.

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 not a de Polignac number, because 16509013 - 2¹ = 16509011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16509011) 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, 62881 + ... + 63142.

It is an arithmetic number, because the mean of its divisors is an integer number (4158792).

Almost surely, 2^16509013 is an apocalyptic number.

It is an amenable number.

16509013 is a deficient number, since it is larger than the sum of its proper divisors (126155).

16509013 is a wasteful number, since it uses less digits than its factorization.

16509013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126154.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 16509013 is about 4063.1284744640. The cubic root of 16509013 is about 254.6285145722.

Adding to 16509013 its reverse (31090561), we get a palindrome (47599574).

The spelling of 16509013 in words is "sixteen million, five hundred nine thousand, thirteen".