2544092721 has 81 divisors (see below), whose sum is σ = 4177894539. Its totient is φ = 1491380352.

The previous prime is 2544092713. The next prime is 2544092743. The reversal of 2544092721 is 1272904452.

The square root of 2544092721 is 50439.

It is a perfect power (a square), and thus also a powerful number.

2544092721 is a `hidden beast` number, since 2 + 544 + 0 + 92 + 7 + 21 = 666.

2544092721 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1980695025 + 563397696 = 44505^2 + 23736^2 .

It is not a de Polignac number, because 2544092721 - 2³ = 2544092713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2544092021) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 59164926 + ... + 59164968.

Almost surely, 2^2544092721 is an apocalyptic number.

2544092721 is the 50439-th square number.

2544092721 is the 25220-th centered octagonal number.

It is an amenable number.

2544092721 is a deficient number, since it is larger than the sum of its proper divisors (1633801818).

2544092721 is a wasteful number, since it uses less digits than its factorization.

2544092721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The cubic root of 2544092721 is about 1365.1414239816.

Multiplying 2544092721 by its sum of digits (36), we get a square (91587337956 = 302634²).

The spelling of 2544092721 in words is "two billion, five hundred forty-four million, ninety-two thousand, seven hundred twenty-one".