4139287861 has 4 divisors (see below), whose sum is σ = 4139572492. Its totient is φ = 4139003232.

The previous prime is 4139287853. The next prime is 4139287877. The reversal of 4139287861 is 1687829314.

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 50324836 + 4088963025 = 7094^2 + 63945^2 .

It is a cyclic number.

It is not a de Polignac number, because 4139287861 - 2³ = 4139287853 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 (4139287661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119256 + ... + 150001.

It is an arithmetic number, because the mean of its divisors is an integer number (1034893123).

Almost surely, 2^4139287861 is an apocalyptic number.

It is an amenable number.

4139287861 is a deficient number, since it is larger than the sum of its proper divisors (284631).

4139287861 is a wasteful number, since it uses less digits than its factorization.

4139287861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284630.

The product of its digits is 580608, while the sum is 49.

The square root of 4139287861 is about 64337.2975885683. The cubic root of 4139287861 is about 1605.6167000876.

The spelling of 4139287861 in words is "four billion, one hundred thirty-nine million, two hundred eighty-seven thousand, eight hundred sixty-one".