8006781139 has 4 divisors (see below), whose sum is σ = 9150607024. Its totient is φ = 6862955256.

The previous prime is 8006781131. The next prime is 8006781143. The reversal of 8006781139 is 9311876008.

8006781139 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 8006781139 - 2³ = 8006781131 is a prime.

It is a super-2 number, since 2×8006781139² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8006781095 and 8006781104.

It is not an unprimeable number, because it can be changed into a prime (8006781131) 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, 571912932 + ... + 571912945.

It is an arithmetic number, because the mean of its divisors is an integer number (2287651756).

Almost surely, 2^8006781139 is an apocalyptic number.

8006781139 is a deficient number, since it is larger than the sum of its proper divisors (1143825885).

8006781139 is a wasteful number, since it uses less digits than its factorization.

8006781139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143825884.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 8006781139 is about 89480.6187897692. The cubic root of 8006781139 is about 2000.5649353257.

The spelling of 8006781139 in words is "eight billion, six million, seven hundred eighty-one thousand, one hundred thirty-nine".