3561561 has 12 divisors (see below), whose sum is σ = 5264688. Its totient is φ = 2318904.

The previous prime is 3561541. The next prime is 3561581. The reversal of 3561561 is 1651653.

It is a happy number.

3561561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3561541) and next prime (3561581).

It is not a de Polignac number, because 3561561 - 2⁵ = 3561529 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (3561511) 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 11 ways as a sum of consecutive naturals, for example, 4215 + ... + 4988.

It is an arithmetic number, because the mean of its divisors is an integer number (438724).

Almost surely, 2^3561561 is an apocalyptic number.

It is an amenable number.

3561561 is a deficient number, since it is larger than the sum of its proper divisors (1703127).

3561561 is a wasteful number, since it uses less digits than its factorization.

3561561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9252 (or 9249 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 3561561 is about 1887.2098452477. The cubic root of 3561561 is about 152.7144488112.

The spelling of 3561561 in words is "three million, five hundred sixty-one thousand, five hundred sixty-one".