16781313 has 32 divisors (see below), whose sum is σ = 24745600. Its totient is φ = 10077696.

The previous prime is 16781299. The next prime is 16781327. The reversal of 16781313 is 31318761.

16781313 is nontrivially palindromic in base 2, base 4, base 8 and base 16.

It is an interprime number because it is at equal distance from previous prime (16781299) and next prime (16781327).

It is not a de Polignac number, because 16781313 - 2⁹ = 16780801 is a prime.

It is a super-2 number, since 2×16781313² = 563224932007938, which contains 22 as substring.

It is the 4097-th Hogben number.

It is not an unprimeable number, because it can be changed into a prime (16781353) by changing a digit.

It is a nontrivial repunit in base 4096.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153903 + ... + 154011.

It is an arithmetic number, because the mean of its divisors is an integer number (773300).

Almost surely, 2^16781313 is an apocalyptic number.

It is an amenable number.

16781313 is a deficient number, since it is larger than the sum of its proper divisors (7964287).

16781313 is a wasteful number, since it uses less digits than its factorization.

16781313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

The product of its digits is 3024, while the sum is 30.

The square root of 16781313 is about 4096.5000915416. The cubic root of 16781313 is about 256.0208367236.

The spelling of 16781313 in words is "sixteen million, seven hundred eighty-one thousand, three hundred thirteen".