2271985945 has 4 divisors (see below), whose sum is σ = 2726383140. Its totient is φ = 1817588752.

The previous prime is 2271985921. The next prime is 2271985949. The reversal of 2271985945 is 5495891722.

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 1513754649 + 758231296 = 38907^2 + 27536^2 .

It is a cyclic number.

It is not a de Polignac number, because 2271985945 - 2⁵ = 2271985913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2271985892 and 2271985901.

It is not an unprimeable number, because it can be changed into a prime (2271985949) 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, 227198590 + ... + 227198599.

It is an arithmetic number, because the mean of its divisors is an integer number (681595785).

Almost surely, 2^2271985945 is an apocalyptic number.

It is an amenable number.

2271985945 is a deficient number, since it is larger than the sum of its proper divisors (454397195).

2271985945 is an equidigital number, since it uses as much as digits as its factorization.

2271985945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454397194.

The product of its digits is 1814400, while the sum is 52.

The square root of 2271985945 is about 47665.3537173490. The cubic root of 2271985945 is about 1314.6249794419.

The spelling of 2271985945 in words is "two billion, two hundred seventy-one million, nine hundred eighty-five thousand, nine hundred forty-five".