16551313 has 4 divisors (see below), whose sum is σ = 16822708. Its totient is φ = 16279920.

The previous prime is 16551287. The next prime is 16551341. The reversal of 16551313 is 31315561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31315561 = 487 ⋅64303.

It can be written as a sum of positive squares in 2 ways, for example, as 3359889 + 13191424 = 1833^2 + 3632^2 .

It is a cyclic number.

It is not a de Polignac number, because 16551313 - 2⁵ = 16551281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16551343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135606 + ... + 135727.

It is an arithmetic number, because the mean of its divisors is an integer number (4205677).

Almost surely, 2^16551313 is an apocalyptic number.

It is an amenable number.

16551313 is a deficient number, since it is larger than the sum of its proper divisors (271395).

16551313 is an equidigital number, since it uses as much as digits as its factorization.

16551313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271394.

The product of its digits is 1350, while the sum is 25.

The square root of 16551313 is about 4068.3304929664. The cubic root of 16551313 is about 254.8458019440.

Adding to 16551313 its reverse (31315561), we get a palindrome (47866874).

The spelling of 16551313 in words is "sixteen million, five hundred fifty-one thousand, three hundred thirteen".