3556561 has 8 divisors (see below), whose sum is σ = 3650240. Its totient is φ = 3464208.

The previous prime is 3556547. The next prime is 3556571. The reversal of 3556561 is 1656553.

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 3556561 - 2¹⁷ = 3425489 is a prime.

It is a super-2 number, since 2×3556561² = 25298252293442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3556571) 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, 7060 + ... + 7546.

It is an arithmetic number, because the mean of its divisors is an integer number (456280).

Almost surely, 2^3556561 is an apocalyptic number.

It is an amenable number.

3556561 is a deficient number, since it is larger than the sum of its proper divisors (93679).

3556561 is a wasteful number, since it uses less digits than its factorization.

3556561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663.

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

The square root of 3556561 is about 1885.8846730381. The cubic root of 3556561 is about 152.6429511501.

The spelling of 3556561 in words is "three million, five hundred fifty-six thousand, five hundred sixty-one".