16515013 has 4 divisors (see below), whose sum is σ = 16526188. Its totient is φ = 16503840.

The previous prime is 16514977. The next prime is 16515019. The reversal of 16515013 is 31051561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31051561 = 599 ⋅51839.

It can be written as a sum of positive squares in 2 ways, for example, as 2362369 + 14152644 = 1537^2 + 3762^2 .

It is a cyclic number.

It is not a de Polignac number, because 16515013 - 2⁹ = 16514501 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 (16515019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2958 + ... + 6463.

It is an arithmetic number, because the mean of its divisors is an integer number (4131547).

Almost surely, 2^16515013 is an apocalyptic number.

It is an amenable number.

16515013 is a deficient number, since it is larger than the sum of its proper divisors (11175).

16515013 is an equidigital number, since it uses as much as digits as its factorization.

16515013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11174.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 16515013 is about 4063.8667547054. The cubic root of 16515013 is about 254.6593580483.

Adding to 16515013 its reverse (31051561), we get a palindrome (47566574).

The spelling of 16515013 in words is "sixteen million, five hundred fifteen thousand, thirteen".