1644352313 has 8 divisors (see below), whose sum is σ = 1707814656. Its totient is φ = 1581541200.

The previous prime is 1644352301. The next prime is 1644352337. The reversal of 1644352313 is 3132534461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1644352313 - 2¹⁸ = 1644090169 is a prime.

It is a super-3 number, since 3×1644352313³ (a number of 29 digits) contains 333 as substring.

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 1644352313.

It is not an unprimeable number, because it can be changed into a prime (1644352393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157658 + ... + 167763.

It is an arithmetic number, because the mean of its divisors is an integer number (213476832).

Almost surely, 2^1644352313 is an apocalyptic number.

It is an amenable number.

1644352313 is a deficient number, since it is larger than the sum of its proper divisors (63462343).

1644352313 is a wasteful number, since it uses less digits than its factorization.

1644352313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325615.

The product of its digits is 25920, while the sum is 32.

The square root of 1644352313 is about 40550.6142123643. The cubic root of 1644352313 is about 1180.3159914530.

Adding to 1644352313 its reverse (3132534461), we get a palindrome (4776886774).

The spelling of 1644352313 in words is "one billion, six hundred forty-four million, three hundred fifty-two thousand, three hundred thirteen".