1643422133 has 4 divisors (see below), whose sum is σ = 1644778188. Its totient is φ = 1642066080.

The previous prime is 1643422129. The next prime is 1643422177. The reversal of 1643422133 is 3312243461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3312243461 = 2063 ⋅1605547.

It can be written as a sum of positive squares in 2 ways, for example, as 184334929 + 1459087204 = 13577^2 + 38198^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643422133 - 2² = 1643422129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1643422096 and 1643422105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643422433) 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, 676208 + ... + 678633.

It is an arithmetic number, because the mean of its divisors is an integer number (411194547).

Almost surely, 2^1643422133 is an apocalyptic number.

It is an amenable number.

1643422133 is a deficient number, since it is larger than the sum of its proper divisors (1356055).

1643422133 is a wasteful number, since it uses less digits than its factorization.

1643422133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356054.

The product of its digits is 10368, while the sum is 29.

The square root of 1643422133 is about 40539.1432198560. The cubic root of 1643422133 is about 1180.0933884242.

Adding to 1643422133 its reverse (3312243461), we get a palindrome (4955665594).

The spelling of 1643422133 in words is "one billion, six hundred forty-three million, four hundred twenty-two thousand, one hundred thirty-three".