6539381 has 4 divisors (see below), whose sum is σ = 6545952. Its totient is φ = 6532812.

The previous prime is 6539371. The next prime is 6539387. The reversal of 6539381 is 1839356.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6539381 - 2⁶ = 6539317 is a prime.

It is a super-2 number, since 2×6539381² = 85527007726322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6539387) 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, 1451 + ... + 3896.

It is an arithmetic number, because the mean of its divisors is an integer number (1636488).

Almost surely, 2^6539381 is an apocalyptic number.

It is an amenable number.

6539381 is a deficient number, since it is larger than the sum of its proper divisors (6571).

6539381 is a wasteful number, since it uses less digits than its factorization.

6539381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6570.

The product of its digits is 19440, while the sum is 35.

The square root of 6539381 is about 2557.2213435681. The cubic root of 6539381 is about 187.0016967255.

The spelling of 6539381 in words is "six million, five hundred thirty-nine thousand, three hundred eighty-one".