16299681 has 4 divisors (see below), whose sum is σ = 21732912. Its totient is φ = 10866452.

The previous prime is 16299667. The next prime is 16299691. The reversal of 16299681 is 18699261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16299681 - 2⁵ = 16299649 is a prime.

It is a super-2 number, since 2×16299681² = 531359201403522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16299601) 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, 2716611 + ... + 2716616.

It is an arithmetic number, because the mean of its divisors is an integer number (5433228).

Almost surely, 2^16299681 is an apocalyptic number.

It is an amenable number.

16299681 is a deficient number, since it is larger than the sum of its proper divisors (5433231).

16299681 is an equidigital number, since it uses as much as digits as its factorization.

16299681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433230.

The product of its digits is 46656, while the sum is 42.

The square root of 16299681 is about 4037.2863410960. The cubic root of 16299681 is about 253.5477153820.

The spelling of 16299681 in words is "sixteen million, two hundred ninety-nine thousand, six hundred eighty-one".