8242561807 has 4 divisors (see below), whose sum is σ = 8255625136. Its totient is φ = 8229498480.

The previous prime is 8242561777. The next prime is 8242561829. The reversal of 8242561807 is 7081652428.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8242561807 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 (8242561897) 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, 6530718 + ... + 6531979.

It is an arithmetic number, because the mean of its divisors is an integer number (2063906284).

Almost surely, 2^8242561807 is an apocalyptic number.

8242561807 is a deficient number, since it is larger than the sum of its proper divisors (13063329).

8242561807 is a wasteful number, since it uses less digits than its factorization.

8242561807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13063328.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 8242561807 is about 90788.5554847085. Note that the first 3 decimals coincide. The cubic root of 8242561807 is about 2020.0125646214.

The spelling of 8242561807 in words is "eight billion, two hundred forty-two million, five hundred sixty-one thousand, eight hundred seven".