16312729 has 4 divisors (see below), whose sum is σ = 16323876. Its totient is φ = 16301584.

The previous prime is 16312717. The next prime is 16312739. The reversal of 16312729 is 92721361.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 13337104 + 2975625 = 3652^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 16312729 - 2⁹ = 16312217 is a prime.

It is a super-2 number, since 2×16312729² = 532210254854882, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16312729.

It is not an unprimeable number, because it can be changed into a prime (16312739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2974 + ... + 6439.

It is an arithmetic number, because the mean of its divisors is an integer number (4080969).

Almost surely, 2^16312729 is an apocalyptic number.

It is an amenable number.

16312729 is a deficient number, since it is larger than the sum of its proper divisors (11147).

16312729 is an equidigital number, since it uses as much as digits as its factorization.

16312729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11146.

The product of its digits is 4536, while the sum is 31.

The square root of 16312729 is about 4038.9019547397. The cubic root of 16312729 is about 253.6153528655.

The spelling of 16312729 in words is "sixteen million, three hundred twelve thousand, seven hundred twenty-nine".