2750025721 has 4 divisors (see below), whose sum is σ = 2750412132. Its totient is φ = 2749639312.

The previous prime is 2750025683. The next prime is 2750025763. The reversal of 2750025721 is 1275200572.

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 2134440000 + 615585721 = 46200^2 + 24811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2750025721 - 2²³ = 2741637113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2750095721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182326 + ... + 196831.

It is an arithmetic number, because the mean of its divisors is an integer number (687603033).

Almost surely, 2^2750025721 is an apocalyptic number.

It is an amenable number.

2750025721 is a deficient number, since it is larger than the sum of its proper divisors (386411).

2750025721 is an equidigital number, since it uses as much as digits as its factorization.

2750025721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386410.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 2750025721 is about 52440.6876480467. The cubic root of 2750025721 is about 1401.0240332688.

The spelling of 2750025721 in words is "two billion, seven hundred fifty million, twenty-five thousand, seven hundred twenty-one".