2209946561 has 4 divisors (see below), whose sum is σ = 2217145392. Its totient is φ = 2202747732.

The previous prime is 2209946521. The next prime is 2209946567. The reversal of 2209946561 is 1656499022.

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 a de Polignac number, because none of the positive numbers 2^k-2209946561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2209946567) 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, 3598955 + ... + 3599568.

It is an arithmetic number, because the mean of its divisors is an integer number (554286348).

Almost surely, 2^2209946561 is an apocalyptic number.

It is an amenable number.

2209946561 is a deficient number, since it is larger than the sum of its proper divisors (7198831).

2209946561 is an equidigital number, since it uses as much as digits as its factorization.

2209946561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7198830.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 2209946561 is about 47010.0687193712. The cubic root of 2209946561 is about 1302.5485627761.

The spelling of 2209946561 in words is "two billion, two hundred nine million, nine hundred forty-six thousand, five hundred sixty-one".