16143649 has 4 divisors (see below), whose sum is σ = 16171200. Its totient is φ = 16116100.

The previous prime is 16143643. The next prime is 16143661. The reversal of 16143649 is 94634161.

16143649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94634161 = 2411 ⋅39251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16143649 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16143643) 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, 12877 + ... + 14074.

It is an arithmetic number, because the mean of its divisors is an integer number (4042800).

Almost surely, 2^16143649 is an apocalyptic number.

It is an amenable number.

16143649 is a deficient number, since it is larger than the sum of its proper divisors (27551).

16143649 is an equidigital number, since it uses as much as digits as its factorization.

16143649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27550.

The product of its digits is 15552, while the sum is 34.

The square root of 16143649 is about 4017.9160021086. The cubic root of 16143649 is about 252.7360743485.

The spelling of 16143649 in words is "sixteen million, one hundred forty-three thousand, six hundred forty-nine".