1644227133 has 8 divisors (see below), whose sum is σ = 2194429248. Its totient is φ = 1095088224.

The previous prime is 1644227093. The next prime is 1644227153. The reversal of 1644227133 is 3317224461.

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

It is not a de Polignac number, because 1644227133 - 2¹⁴ = 1644210749 is a prime.

It is a super-3 number, since 3×1644227133³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1644227094 and 1644227103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644227153) 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, 262185 + ... + 268382.

It is an arithmetic number, because the mean of its divisors is an integer number (274303656).

Almost surely, 2^1644227133 is an apocalyptic number.

It is an amenable number.

1644227133 is a deficient number, since it is larger than the sum of its proper divisors (550202115).

1644227133 is a wasteful number, since it uses less digits than its factorization.

1644227133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531603.

The product of its digits is 24192, while the sum is 33.

The square root of 1644227133 is about 40549.0706798565. The cubic root of 1644227133 is about 1180.2860392941.

The spelling of 1644227133 in words is "one billion, six hundred forty-four million, two hundred twenty-seven thousand, one hundred thirty-three".