16304513 has 6 divisors (see below), whose sum is σ = 17320326. Its totient is φ = 15345152.

The previous prime is 16304503. The next prime is 16304521. The reversal of 16304513 is 31540361.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 7441984 + 8862529 = 2728^2 + 2977^2 .

It is not a de Polignac number, because 16304513 - 2²² = 12110209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16304503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27920 + ... + 28497.

It is an arithmetic number, because the mean of its divisors is an integer number (2886721).

Almost surely, 2^16304513 is an apocalyptic number.

It is an amenable number.

16304513 is a deficient number, since it is larger than the sum of its proper divisors (1015813).

16304513 is an equidigital number, since it uses as much as digits as its factorization.

16304513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56451 (or 56434 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 16304513 is about 4037.8847185129. The cubic root of 16304513 is about 253.5727674370.

Adding to 16304513 its reverse (31540361), we get a palindrome (47844874).

The spelling of 16304513 in words is "sixteen million, three hundred four thousand, five hundred thirteen".