6540231 has 8 divisors (see below), whose sum is σ = 8956144. Its totient is φ = 4242240.

The previous prime is 6540217. The next prime is 6540239. The reversal of 6540231 is 1320456.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6540231 - 2⁷ = 6540103 is a prime.

It is a super-2 number, since 2×6540231² = 85549243066722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6540198 and 6540207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540239) 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, 29350 + ... + 29571.

It is an arithmetic number, because the mean of its divisors is an integer number (1119518).

Almost surely, 2^6540231 is an apocalyptic number.

6540231 is a deficient number, since it is larger than the sum of its proper divisors (2415913).

6540231 is a wasteful number, since it uses less digits than its factorization.

6540231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58961.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 6540231 is about 2557.3875341841. The cubic root of 6540231 is about 187.0097986420.

Adding to 6540231 its reverse (1320456), we get a palindrome (7860687).

The spelling of 6540231 in words is "six million, five hundred forty thousand, two hundred thirty-one".