16499 has 4 divisors (see below), whose sum is σ = 18864. Its totient is φ = 14136.

The previous prime is 16493. The next prime is 16519. The reversal of 16499 is 99461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99461 = 79 ⋅1259.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16499 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16493) 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, 1172 + ... + 1185.

It is an arithmetic number, because the mean of its divisors is an integer number (4716).

2¹⁶⁴⁹⁹ is an apocalyptic number.

16499 is a deficient number, since it is larger than the sum of its proper divisors (2365).

16499 is an equidigital number, since it uses as much as digits as its factorization.

16499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364.

The product of its digits is 1944, while the sum is 29.

The square root of 16499 is about 128.4484332330. The cubic root of 16499 is about 25.4577025305.

It can be divided in two parts, 1649 and 9, that multiplied together give a palindrome (14841).

The spelling of 16499 in words is "sixteen thousand, four hundred ninety-nine".