1643041241 has 4 divisors (see below), whose sum is σ = 1644579300. Its totient is φ = 1641503184.

The previous prime is 1643041237. The next prime is 1643041243. The reversal of 1643041241 is 1421403461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 697171216 + 945870025 = 26404^2 + 30755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643041241 - 2² = 1643041237 is a prime.

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 1643041241.

It is not an unprimeable number, because it can be changed into a prime (1643041243) 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, 767426 + ... + 769563.

It is an arithmetic number, because the mean of its divisors is an integer number (411144825).

Almost surely, 2^1643041241 is an apocalyptic number.

It is an amenable number.

1643041241 is a deficient number, since it is larger than the sum of its proper divisors (1538059).

1643041241 is a wasteful number, since it uses less digits than its factorization.

1643041241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538058.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1643041241 is about 40534.4451177021. The cubic root of 1643041241 is about 1180.0022122433.

The spelling of 1643041241 in words is "one billion, six hundred forty-three million, forty-one thousand, two hundred forty-one".