3405561 has 4 divisors (see below), whose sum is σ = 4540752. Its totient is φ = 2270372.

The previous prime is 3405547. The next prime is 3405601. The reversal of 3405561 is 1655043.

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 3405561 - 2⁵ = 3405529 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3401561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567591 + ... + 567596.

It is an arithmetic number, because the mean of its divisors is an integer number (1135188).

Almost surely, 2^3405561 is an apocalyptic number.

It is an amenable number.

3405561 is a deficient number, since it is larger than the sum of its proper divisors (1135191).

3405561 is a wasteful number, since it uses less digits than its factorization.

3405561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135190.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 3405561 is about 1845.4162132159. The cubic root of 3405561 is about 150.4513958051.

The spelling of 3405561 in words is "three million, four hundred five thousand, five hundred sixty-one".