6561369 has 6 divisors (see below), whose sum is σ = 9477546. Its totient is φ = 4374240.

The previous prime is 6561319. The next prime is 6561383. The reversal of 6561369 is 9631656.

It can be written as a sum of positive squares in only one way, i.e., 4347225 + 2214144 = 2085^2 + 1488^2 .

It is not a de Polignac number, because 6561369 - 2⁹ = 6560857 is a prime.

It is a super-2 number, since 2×6561369² = 86103126308322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6561319) 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 5 ways as a sum of consecutive naturals, for example, 364512 + ... + 364529.

It is an arithmetic number, because the mean of its divisors is an integer number (1579591).

Almost surely, 2^6561369 is an apocalyptic number.

It is an amenable number.

6561369 is a deficient number, since it is larger than the sum of its proper divisors (2916177).

6561369 is a wasteful number, since it uses less digits than its factorization.

6561369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729047 (or 729044 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 6561369 is about 2561.5169333815. The cubic root of 6561369 is about 187.2110536153.

It can be divided in two parts, 656 and 1369, that added together give a square (2025 = 45²).

The spelling of 6561369 in words is "six million, five hundred sixty-one thousand, three hundred sixty-nine".