6539213 has 8 divisors (see below), whose sum is σ = 6732600. Its totient is φ = 6347520.

The previous prime is 6539209. The next prime is 6539243. The reversal of 6539213 is 3129356.

It can be written as a sum of positive squares in 4 ways, for example, as 1170724 + 5368489 = 1082^2 + 2317^2 .

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 6539213 - 2² = 6539209 is a prime.

It is a super-2 number, since 2×6539213² = 85522613318738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6539243) 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, 14081 + ... + 14537.

It is an arithmetic number, because the mean of its divisors is an integer number (841575).

Almost surely, 2^6539213 is an apocalyptic number.

It is an amenable number.

6539213 is a deficient number, since it is larger than the sum of its proper divisors (193387).

6539213 is a wasteful number, since it uses less digits than its factorization.

6539213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847.

The product of its digits is 4860, while the sum is 29.

The square root of 6539213 is about 2557.1884952033. The cubic root of 6539213 is about 187.0000953225. Note that the first 4 decimals are identical.

The spelling of 6539213 in words is "six million, five hundred thirty-nine thousand, two hundred thirteen".