6561939 has 8 divisors (see below), whose sum is σ = 8773632. Its totient is φ = 4362440.

The previous prime is 6561937. The next prime is 6561941. The reversal of 6561939 is 9391656.

It is an interprime number because it is at equal distance from previous prime (6561937) and next prime (6561941).

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

It is a cyclic number.

It is not a de Polignac number, because 6561939 - 2¹ = 6561937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6561897 and 6561906.

It is not an unprimeable number, because it can be changed into a prime (6561937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1707 + ... + 4004.

It is an arithmetic number, because the mean of its divisors is an integer number (1096704).

Almost surely, 2^6561939 is an apocalyptic number.

6561939 is a deficient number, since it is larger than the sum of its proper divisors (2211693).

6561939 is a wasteful number, since it uses less digits than its factorization.

6561939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6097.

The product of its digits is 43740, while the sum is 39.

The square root of 6561939 is about 2561.6281931615. The cubic root of 6561939 is about 187.2164745984.

The spelling of 6561939 in words is "six million, five hundred sixty-one thousand, nine hundred thirty-nine".