6542139 has 12 divisors (see below), whose sum is σ = 9037496. Its totient is φ = 4209408.

The previous prime is 6542131. The next prime is 6542141. The reversal of 6542139 is 9312456.

It is not a de Polignac number, because 6542139 - 2³ = 6542131 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 (6542131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1227 + ... + 3819.

Almost surely, 2^6542139 is an apocalyptic number.

6542139 is a deficient number, since it is larger than the sum of its proper divisors (2495357).

6542139 is a wasteful number, since it uses less digits than its factorization.

6542139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654 (or 2625 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 6542139 is about 2557.7605439134. The cubic root of 6542139 is about 187.0279825055.

The spelling of 6542139 in words is "six million, five hundred forty-two thousand, one hundred thirty-nine".