6540557 has 2 divisors, whose sum is σ = 6540558. Its totient is φ = 6540556.

The previous prime is 6540539. The next prime is 6540587. The reversal of 6540557 is 7550456.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4541161 + 1999396 = 2131^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 6540557 - 2⁶ = 6540493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6540587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270278 + 3270279.

It is an arithmetic number, because the mean of its divisors is an integer number (3270279).

Almost surely, 2^6540557 is an apocalyptic number.

It is an amenable number.

6540557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6540557 is an equidigital number, since it uses as much as digits as its factorization.

6540557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 6540557 is about 2557.4512703080. The cubic root of 6540557 is about 187.0129057790.

The spelling of 6540557 in words is "six million, five hundred forty thousand, five hundred fifty-seven".