6561149 has 12 divisors (see below), whose sum is σ = 7675164. Its totient is φ = 5592384.

The previous prime is 6561143. The next prime is 6561151. The reversal of 6561149 is 9411656.

It can be written as a sum of positive squares in 2 ways, for example, as 5968249 + 592900 = 2443^2 + 770^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6561149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14129 + ... + 14585.

It is an arithmetic number, because the mean of its divisors is an integer number (639597).

Almost surely, 2^6561149 is an apocalyptic number.

It is an amenable number.

6561149 is a deficient number, since it is larger than the sum of its proper divisors (1114015).

6561149 is a wasteful number, since it uses less digits than its factorization.

6561149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 757 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 6561149 is about 2561.4739897176. The cubic root of 6561149 is about 187.2089612221.

The spelling of 6561149 in words is "six million, five hundred sixty-one thousand, one hundred forty-nine".