6561090 has 24 divisors (see below), whose sum is σ = 17059068. Its totient is φ = 1749600.

The previous prime is 6561089. The next prime is 6561091. The reversal of 6561090 is 901656.

6561090 is a `hidden beast` number, since 656 + 1 + 0 + 9 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (6561089) and next prime (6561091).

It can be written as a sum of positive squares in 2 ways, for example, as 5919489 + 641601 = 2433^2 + 801^2 .

It is an Ulam number.

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 (6561091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36361 + ... + 36540.

Almost surely, 2^6561090 is an apocalyptic number.

6561090 is an abundant number, since it is smaller than the sum of its proper divisors (10497978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6561090 is a wasteful number, since it uses less digits than its factorization.

6561090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72914 (or 72911 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 6561090 is about 2561.4624728854. The cubic root of 6561090 is about 187.2084000723.

It can be divided in two parts, 65610 and 90, that multiplied together give a square (5904900 = 2430²).

The spelling of 6561090 in words is "six million, five hundred sixty-one thousand, ninety".