16644129 has 4 divisors (see below), whose sum is σ = 22192176. Its totient is φ = 11096084.

The previous prime is 16644119. The next prime is 16644137. The reversal of 16644129 is 92144661.

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 16644129 - 2⁴ = 16644113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16644129.

It is not an unprimeable number, because it can be changed into a prime (16644119) 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, 2774019 + ... + 2774024.

It is an arithmetic number, because the mean of its divisors is an integer number (5548044).

Almost surely, 2^16644129 is an apocalyptic number.

It is an amenable number.

16644129 is a deficient number, since it is larger than the sum of its proper divisors (5548047).

16644129 is an equidigital number, since it uses as much as digits as its factorization.

16644129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5548046.

The product of its digits is 10368, while the sum is 33.

The square root of 16644129 is about 4079.7216816837. The cubic root of 16644129 is about 255.3212866826.

The spelling of 16644129 in words is "sixteen million, six hundred forty-four thousand, one hundred twenty-nine".