1644113123 has 4 divisors (see below), whose sum is σ = 1644245208. Its totient is φ = 1643981040.

The previous prime is 1644113099. The next prime is 1644113131. The reversal of 1644113123 is 3213114461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3213114461 = 17 ⋅189006733.

It is a cyclic number.

It is not a de Polignac number, because 1644113123 - 2⁶ = 1644113059 is a prime.

It is a super-3 number, since 3×1644113123³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1644113092 and 1644113101.

It is not an unprimeable number, because it can be changed into a prime (1644113143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45173 + ... + 72998.

It is an arithmetic number, because the mean of its divisors is an integer number (411061302).

Almost surely, 2^1644113123 is an apocalyptic number.

1644113123 is a deficient number, since it is larger than the sum of its proper divisors (132085).

1644113123 is a wasteful number, since it uses less digits than its factorization.

1644113123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132084.

The product of its digits is 1728, while the sum is 26.

The square root of 1644113123 is about 40547.6648279528. The cubic root of 1644113123 is about 1180.2587584886.

Adding to 1644113123 its reverse (3213114461), we get a palindrome (4857227584).

The spelling of 1644113123 in words is "one billion, six hundred forty-four million, one hundred thirteen thousand, one hundred twenty-three".