1643004441 has 12 divisors (see below), whose sum is σ = 2555784868. Its totient is φ = 1011079584.

The previous prime is 1643004409. The next prime is 1643004443. The reversal of 1643004441 is 1444003461.

It can be written as a sum of positive squares in 2 ways, for example, as 784280025 + 858724416 = 28005^2 + 29304^2 .

It is not a de Polignac number, because 1643004441 - 2⁵ = 1643004409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1643004443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7021270 + ... + 7021503.

Almost surely, 2^1643004441 is an apocalyptic number.

It is an amenable number.

1643004441 is a deficient number, since it is larger than the sum of its proper divisors (912780427).

1643004441 is a wasteful number, since it uses less digits than its factorization.

1643004441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14042792 (or 14042789 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1643004441 is about 40533.9911802428. The cubic root of 1643004441 is about 1179.9934024815.

The spelling of 1643004441 in words is "one billion, six hundred forty-three million, four thousand, four hundred forty-one".