4431649 has 4 divisors (see below), whose sum is σ = 4539780. Its totient is φ = 4323520.

The previous prime is 4431643. The next prime is 4431653. The reversal of 4431649 is 9461344.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1166400 + 3265249 = 1080^2 + 1807^2 .

It is a cyclic number.

It is not a de Polignac number, because 4431649 - 2³ = 4431641 is a prime.

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 4431649.

It is not an unprimeable number, because it can be changed into a prime (4431641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54004 + ... + 54085.

It is an arithmetic number, because the mean of its divisors is an integer number (1134945).

Almost surely, 2^4431649 is an apocalyptic number.

It is an amenable number.

4431649 is a deficient number, since it is larger than the sum of its proper divisors (108131).

4431649 is a wasteful number, since it uses less digits than its factorization.

4431649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108130.

The product of its digits is 10368, while the sum is 31.

The square root of 4431649 is about 2105.1482133095. The cubic root of 4431649 is about 164.2562052319.

It can be divided in two parts, 4 and 431649, that multiplied together give a square (1726596 = 1314²).

The spelling of 4431649 in words is "four million, four hundred thirty-one thousand, six hundred forty-nine".