6561250 has 40 divisors (see below), whose sum is σ = 12792780. Its totient is φ = 2520000.

The previous prime is 6561223. The next prime is 6561259. The reversal of 6561250 is 521656.

It can be written as a sum of positive squares in 10 ways, for example, as 2163841 + 4397409 = 1471^2 + 2097^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (6561259) 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 19 ways as a sum of consecutive naturals, for example, 36160 + ... + 36340.

Almost surely, 2^6561250 is an apocalyptic number.

6561250 is a deficient number, since it is larger than the sum of its proper divisors (6231530).

6561250 is a wasteful number, since it uses less digits than its factorization.

6561250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 6561250 is about 2561.4937048527. The cubic root of 6561250 is about 187.2099218266.

6561250 divided by its sum of digits (25) gives a triangular number (262450 = T₇₂₄).

The spelling of 6561250 in words is "six million, five hundred sixty-one thousand, two hundred fifty".