3561655 has 4 divisors (see below), whose sum is σ = 4273992. Its totient is φ = 2849320.

The previous prime is 3561643. The next prime is 3561659. The reversal of 3561655 is 5561653.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5561653 = 23 ⋅241811.

It is not a de Polignac number, because 3561655 - 2¹¹ = 3559607 is a prime.

It is a Duffinian number.

3561655 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3561659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356161 + ... + 356170.

It is an arithmetic number, because the mean of its divisors is an integer number (1068498).

Almost surely, 2^3561655 is an apocalyptic number.

3561655 is a deficient number, since it is larger than the sum of its proper divisors (712337).

3561655 is an equidigital number, since it uses as much as digits as its factorization.

3561655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712336.

The product of its digits is 13500, while the sum is 31.

The square root of 3561655 is about 1887.2347495741. The cubic root of 3561655 is about 152.7157923262.

The spelling of 3561655 in words is "three million, five hundred sixty-one thousand, six hundred fifty-five".