16505013 has 12 divisors (see below), whose sum is σ = 25599840. Its totient is φ = 9431352.

The previous prime is 16505009. The next prime is 16505017. The reversal of 16505013 is 31050561.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16505009) and next prime (16505017).

It is not a de Polignac number, because 16505013 - 2² = 16505009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55993 + ... + 56286.

It is an arithmetic number, because the mean of its divisors is an integer number (2133320).

Almost surely, 2^16505013 is an apocalyptic number.

It is an amenable number.

16505013 is a deficient number, since it is larger than the sum of its proper divisors (9094827).

16505013 is a wasteful number, since it uses less digits than its factorization.

16505013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112296 (or 112289 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 16505013 is about 4062.6362131010. The cubic root of 16505013 is about 254.6079481029.

Adding to 16505013 its reverse (31050561), we get a palindrome (47555574).

The spelling of 16505013 in words is "sixteen million, five hundred five thousand, thirteen".