2543152721 has 4 divisors (see below), whose sum is σ = 2559994944. Its totient is φ = 2526310500.

The previous prime is 2543152691. The next prime is 2543152727. The reversal of 2543152721 is 1272513452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2543152721 - 2¹⁸ = 2542890577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2543152727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8420885 + ... + 8421186.

It is an arithmetic number, because the mean of its divisors is an integer number (639998736).

Almost surely, 2^2543152721 is an apocalyptic number.

It is an amenable number.

2543152721 is a deficient number, since it is larger than the sum of its proper divisors (16842223).

2543152721 is a wasteful number, since it uses less digits than its factorization.

2543152721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16842222.

The product of its digits is 16800, while the sum is 32.

The square root of 2543152721 is about 50429.6809527881. The cubic root of 2543152721 is about 1364.9732709101.

The spelling of 2543152721 in words is "two billion, five hundred forty-three million, one hundred fifty-two thousand, seven hundred twenty-one".