4909561 has 4 divisors (see below), whose sum is σ = 4914000. Its totient is φ = 4905124.

The previous prime is 4909537. The next prime is 4909577. The reversal of 4909561 is 1659094.

4909561 is digitally balanced in base 3, 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1659094 = 2 ⋅829547.

It is a cyclic number.

It is not a de Polignac number, because 4909561 - 2¹⁷ = 4778489 is a prime.

It is a Duffinian number.

4909561 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4909361) 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, 930 + ... + 3268.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^4909561 is an apocalyptic number.

It is an amenable number.

4909561 is a deficient number, since it is larger than the sum of its proper divisors (4439).

4909561 is a wasteful number, since it uses less digits than its factorization.

4909561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4438.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 4909561 is about 2215.7529194384. The cubic root of 4909561 is about 169.9603252281.

The spelling of 4909561 in words is "four million, nine hundred nine thousand, five hundred sixty-one".