2725524721 has 4 divisors (see below), whose sum is σ = 2753623012. Its totient is φ = 2697426432.

The previous prime is 2725524707. The next prime is 2725524731. The reversal of 2725524721 is 1274255272.

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 1594884096 + 1130640625 = 39936^2 + 33625^2 .

It is a cyclic number.

It is not a de Polignac number, because 2725524721 - 2¹⁹ = 2725000433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2725524731) 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, 14049000 + ... + 14049193.

It is an arithmetic number, because the mean of its divisors is an integer number (688405753).

Almost surely, 2^2725524721 is an apocalyptic number.

It is an amenable number.

2725524721 is a deficient number, since it is larger than the sum of its proper divisors (28098291).

2725524721 is an equidigital number, since it uses as much as digits as its factorization.

2725524721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28098290.

The product of its digits is 78400, while the sum is 37.

The square root of 2725524721 is about 52206.5582182928. The cubic root of 2725524721 is about 1396.8508674626.

Adding to 2725524721 its reverse (1274255272), we get a palindrome (3999779993).

The spelling of 2725524721 in words is "two billion, seven hundred twenty-five million, five hundred twenty-four thousand, seven hundred twenty-one".