3557561 has 4 divisors (see below), whose sum is σ = 4065792. Its totient is φ = 3049332.

The previous prime is 3557557. The next prime is 3557563. The reversal of 3557561 is 1657553.

3557561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3557561 - 2² = 3557557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3557563) 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 3 ways as a sum of consecutive naturals, for example, 254105 + ... + 254118.

It is an arithmetic number, because the mean of its divisors is an integer number (1016448).

Almost surely, 2^3557561 is an apocalyptic number.

It is an amenable number.

3557561 is a deficient number, since it is larger than the sum of its proper divisors (508231).

3557561 is an equidigital number, since it uses as much as digits as its factorization.

3557561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508230.

The product of its digits is 15750, while the sum is 32.

The square root of 3557561 is about 1886.1497819632. The cubic root of 3557561 is about 152.6572560406.

The spelling of 3557561 in words is "three million, five hundred fifty-seven thousand, five hundred sixty-one".