2201561 has 4 divisors (see below), whose sum is σ = 2214912. Its totient is φ = 2188212.

The previous prime is 2201543. The next prime is 2201581. The reversal of 2201561 is 1651022.

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 2201561 - 2¹⁰ = 2200537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2201501) 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, 6425 + ... + 6758.

It is an arithmetic number, because the mean of its divisors is an integer number (553728).

2^2201561 is an apocalyptic number.

It is an amenable number.

2201561 is a deficient number, since it is larger than the sum of its proper divisors (13351).

2201561 is a wasteful number, since it uses less digits than its factorization.

2201561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13350.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2201561 is about 1483.7658171019. The cubic root of 2201561 is about 130.0898983709.

Adding to 2201561 its reverse (1651022), we get a palindrome (3852583).

The spelling of 2201561 in words is "two million, two hundred one thousand, five hundred sixty-one".