6538155139 has 4 divisors (see below), whose sum is σ = 6539618056. Its totient is φ = 6536692224.

The previous prime is 6538155121. The next prime is 6538155179. The reversal of 6538155139 is 9315518356.

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 6538155139 - 2⁷ = 6538155011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6538155119) 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, 724734 + ... + 733699.

It is an arithmetic number, because the mean of its divisors is an integer number (1634904514).

Almost surely, 2^6538155139 is an apocalyptic number.

6538155139 is a deficient number, since it is larger than the sum of its proper divisors (1462917).

6538155139 is a wasteful number, since it uses less digits than its factorization.

6538155139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462916.

The product of its digits is 486000, while the sum is 46.

The square root of 6538155139 is about 80858.8593723656. The cubic root of 6538155139 is about 1869.9001099092.

The spelling of 6538155139 in words is "six billion, five hundred thirty-eight million, one hundred fifty-five thousand, one hundred thirty-nine".