6561290 has 8 divisors (see below), whose sum is σ = 11810340. Its totient is φ = 2624512.

The previous prime is 6561287. The next prime is 6561293. The reversal of 6561290 is 921656.

It is an interprime number because it is at equal distance from previous prime (6561287) and next prime (6561293).

It can be written as a sum of positive squares in 2 ways, for example, as 6385729 + 175561 = 2527^2 + 419^2 .

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

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 (6561293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328055 + ... + 328074.

Almost surely, 2^6561290 is an apocalyptic number.

6561290 is a deficient number, since it is larger than the sum of its proper divisors (5249050).

6561290 is a wasteful number, since it uses less digits than its factorization.

6561290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656136.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 6561290 is about 2561.5015127850. The cubic root of 6561290 is about 187.2103022613.

The spelling of 6561290 in words is "six million, five hundred sixty-one thousand, two hundred ninety".