1644814049 has 4 divisors (see below), whose sum is σ = 1665634560. Its totient is φ = 1623993540.

The previous prime is 1644814037. The next prime is 1644814051. The reversal of 1644814049 is 9404184461.

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 1644814049 - 2²⁴ = 1628036833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1644813997 and 1644814015.

It is not an unprimeable number, because it can be changed into a prime (1644814069) 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, 10410137 + ... + 10410294.

It is an arithmetic number, because the mean of its divisors is an integer number (416408640).

Almost surely, 2^1644814049 is an apocalyptic number.

It is an amenable number.

1644814049 is a deficient number, since it is larger than the sum of its proper divisors (20820511).

1644814049 is an equidigital number, since it uses as much as digits as its factorization.

1644814049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20820510.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 1644814049 is about 40556.3071420464. The cubic root of 1644814049 is about 1180.4264591381.

The spelling of 1644814049 in words is "one billion, six hundred forty-four million, eight hundred fourteen thousand, forty-nine".