4391845861 has 4 divisors (see below), whose sum is σ = 4729680172. Its totient is φ = 4054011552.

The previous prime is 4391845849. The next prime is 4391845867. The reversal of 4391845861 is 1685481934.

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: 1685481934 = 2 ⋅842740967.

It can be written as a sum of positive squares in 2 ways, for example, as 2992637025 + 1399208836 = 54705^2 + 37406^2 .

It is a cyclic number.

It is not a de Polignac number, because 4391845861 - 2¹⁹ = 4391321573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4391845867) 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, 168917136 + ... + 168917161.

It is an arithmetic number, because the mean of its divisors is an integer number (1182420043).

Almost surely, 2^4391845861 is an apocalyptic number.

It is an amenable number.

4391845861 is a deficient number, since it is larger than the sum of its proper divisors (337834311).

4391845861 is a wasteful number, since it uses less digits than its factorization.

4391845861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337834310.

The product of its digits is 829440, while the sum is 49.

The square root of 4391845861 is about 66271.0031688068. The cubic root of 4391845861 is about 1637.6296638074.

The spelling of 4391845861 in words is "four billion, three hundred ninety-one million, eight hundred forty-five thousand, eight hundred sixty-one".