2137644205 has 4 divisors (see below), whose sum is σ = 2565173052. Its totient is φ = 1710115360.

The previous prime is 2137644203. The next prime is 2137644221. The reversal of 2137644205 is 5024467312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1142304804 + 995339401 = 33798^2 + 31549^2 .

It is not a de Polignac number, because 2137644205 - 2¹ = 2137644203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2137644203) 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, 213764416 + ... + 213764425.

It is an arithmetic number, because the mean of its divisors is an integer number (641293263).

Almost surely, 2^2137644205 is an apocalyptic number.

It is an amenable number.

2137644205 is a deficient number, since it is larger than the sum of its proper divisors (427528847).

2137644205 is an equidigital number, since it uses as much as digits as its factorization.

2137644205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427528846.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 2137644205 is about 46234.6645386338. The cubic root of 2137644205 is about 1288.1857004104.

The spelling of 2137644205 in words is "two billion, one hundred thirty-seven million, six hundred forty-four thousand, two hundred five".