8442001861 has 4 divisors (see below), whose sum is σ = 8445660300. Its totient is φ = 8438343424.

The previous prime is 8442001837. The next prime is 8442001879. The reversal of 8442001861 is 1681002448.

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 5536252836 + 2905749025 = 74406^2 + 53905^2 .

It is a cyclic number.

It is not a de Polignac number, because 8442001861 - 2¹⁹ = 8441477573 is a prime.

It is a super-2 number, since 2×8442001861² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8442001261) 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, 1825756 + ... + 1830373.

It is an arithmetic number, because the mean of its divisors is an integer number (2111415075).

Almost surely, 2^8442001861 is an apocalyptic number.

It is an amenable number.

8442001861 is a deficient number, since it is larger than the sum of its proper divisors (3658439).

8442001861 is a wasteful number, since it uses less digits than its factorization.

8442001861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658438.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 8442001861 is about 91880.3671139814. The cubic root of 8442001861 is about 2036.1752200942.

The spelling of 8442001861 in words is "eight billion, four hundred forty-two million, one thousand, eight hundred sixty-one".