2208636641 has 4 divisors (see below), whose sum is σ = 2228182212. Its totient is φ = 2189091072.

The previous prime is 2208636629. The next prime is 2208636653. The reversal of 2208636641 is 1466368022.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2208636629) and next prime (2208636653).

It can be written as a sum of positive squares in 2 ways, for example, as 192626641 + 2016010000 = 13879^2 + 44900^2 .

It is a cyclic number.

It is not a de Polignac number, because 2208636641 - 2²⁶ = 2141527777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2208636595 and 2208636604.

It is not an unprimeable number, because it can be changed into a prime (2208636601) 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, 9772616 + ... + 9772841.

It is an arithmetic number, because the mean of its divisors is an integer number (557045553).

Almost surely, 2^2208636641 is an apocalyptic number.

It is an amenable number.

2208636641 is a deficient number, since it is larger than the sum of its proper divisors (19545571).

2208636641 is a wasteful number, since it uses less digits than its factorization.

2208636641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19545570.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 2208636641 is about 46996.1343197502. The cubic root of 2208636641 is about 1302.2911550977.

The spelling of 2208636641 in words is "two billion, two hundred eight million, six hundred thirty-six thousand, six hundred forty-one".