16133999 has 4 divisors (see below), whose sum is σ = 18438864. Its totient is φ = 13829136.

The previous prime is 16133977. The next prime is 16134007. The reversal of 16133999 is 99933161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16133999 - 2⁸ = 16133743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16133939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1152422 + ... + 1152435.

It is an arithmetic number, because the mean of its divisors is an integer number (4609716).

Almost surely, 2^16133999 is an apocalyptic number.

16133999 is a deficient number, since it is larger than the sum of its proper divisors (2304865).

16133999 is an equidigital number, since it uses as much as digits as its factorization.

16133999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304864.

The product of its digits is 39366, while the sum is 41.

The square root of 16133999 is about 4016.7149513004. The cubic root of 16133999 is about 252.6857059500.

Adding to 16133999 its sum of digits (41), we get a triangular number (16134040 = T₅₆₈₀).

The spelling of 16133999 in words is "sixteen million, one hundred thirty-three thousand, nine hundred ninety-nine".