2225543521 has 4 divisors (see below), whose sum is σ = 2225958292. Its totient is φ = 2225128752.

The previous prime is 2225543519. The next prime is 2225543533. The reversal of 2225543521 is 1253455222.

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 921972496 + 1303571025 = 30364^2 + 36105^2 .

It is a cyclic number.

It is not a de Polignac number, because 2225543521 - 2¹ = 2225543519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2225544521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199230 + ... + 210103.

It is an arithmetic number, because the mean of its divisors is an integer number (556489573).

Almost surely, 2^2225543521 is an apocalyptic number.

It is an amenable number.

2225543521 is a deficient number, since it is larger than the sum of its proper divisors (414771).

2225543521 is an equidigital number, since it uses as much as digits as its factorization.

2225543521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414770.

The product of its digits is 24000, while the sum is 31.

The square root of 2225543521 is about 47175.6666195614. Note that the first 4 decimals coincide. The cubic root of 2225543521 is about 1305.6056790263.

Adding to 2225543521 its reverse (1253455222), we get a palindrome (3478998743).

It can be divided in two parts, 2225543 and 521, that added together give a square (2226064 = 1492²).

The spelling of 2225543521 in words is "two billion, two hundred twenty-five million, five hundred forty-three thousand, five hundred twenty-one".