7405561 has 4 divisors (see below), whose sum is σ = 7462224. Its totient is φ = 7348900.

The previous prime is 7405547. The next prime is 7405571. The reversal of 7405561 is 1655047.

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 7405561 - 2⁵ = 7405529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7405501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28135 + ... + 28396.

It is an arithmetic number, because the mean of its divisors is an integer number (1865556).

Almost surely, 2^7405561 is an apocalyptic number.

It is an amenable number.

7405561 is a deficient number, since it is larger than the sum of its proper divisors (56663).

7405561 is a wasteful number, since it uses less digits than its factorization.

7405561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56662.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 7405561 is about 2721.3160419180. The cubic root of 7405561 is about 194.9183177509.

The spelling of 7405561 in words is "seven million, four hundred five thousand, five hundred sixty-one".