2861881639 has 8 divisors (see below), whose sum is σ = 2884785120. Its totient is φ = 2839007616.

The previous prime is 2861881621. The next prime is 2861881657. The reversal of 2861881639 is 9361881682.

2861881639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2861881621) and next prime (2861881657).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2861881639 - 2³¹ = 714397991 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 (2861881619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213942 + ... + 226924.

It is an arithmetic number, because the mean of its divisors is an integer number (360598140).

Almost surely, 2^2861881639 is an apocalyptic number.

2861881639 is a deficient number, since it is larger than the sum of its proper divisors (22903481).

2861881639 is a wasteful number, since it uses less digits than its factorization.

2861881639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14729.

The product of its digits is 995328, while the sum is 52.

The square root of 2861881639 is about 53496.5572630613. The cubic root of 2861881639 is about 1419.7674748203.

The spelling of 2861881639 in words is "two billion, eight hundred sixty-one million, eight hundred eighty-one thousand, six hundred thirty-nine".