4391344645 has 4 divisors (see below), whose sum is σ = 5269613580. Its totient is φ = 3513075712.

The previous prime is 4391344637. The next prime is 4391344663. The reversal of 4391344645 is 5464431934.

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 1433833956 + 2957510689 = 37866^2 + 54383^2 .

It is a cyclic number.

It is not a de Polignac number, because 4391344645 - 2³ = 4391344637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439134460 + ... + 439134469.

It is an arithmetic number, because the mean of its divisors is an integer number (1317403395).

Almost surely, 2^4391344645 is an apocalyptic number.

It is an amenable number.

4391344645 is a deficient number, since it is larger than the sum of its proper divisors (878268935).

4391344645 is an equidigital number, since it uses as much as digits as its factorization.

4391344645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878268934.

The product of its digits is 622080, while the sum is 43.

The square root of 4391344645 is about 66267.2214975096. The cubic root of 4391344645 is about 1637.5673636992.

The spelling of 4391344645 in words is "four billion, three hundred ninety-one million, three hundred forty-four thousand, six hundred forty-five".