6561457 has 4 divisors (see below), whose sum is σ = 7498816. Its totient is φ = 5624100.

The previous prime is 6561437. The next prime is 6561461. The reversal of 6561457 is 7541656.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 6561457 - 2¹¹ = 6559409 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6561427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468669 + ... + 468682.

It is an arithmetic number, because the mean of its divisors is an integer number (1874704).

Almost surely, 2^6561457 is an apocalyptic number.

It is an amenable number.

6561457 is a deficient number, since it is larger than the sum of its proper divisors (937359).

6561457 is an equidigital number, since it uses as much as digits as its factorization.

6561457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937358.

The product of its digits is 25200, while the sum is 34.

The square root of 6561457 is about 2561.5341106454. The cubic root of 6561457 is about 187.2118905595.

The spelling of 6561457 in words is "six million, five hundred sixty-one thousand, four hundred fifty-seven".