2521745 has 4 divisors (see below), whose sum is σ = 3026100. Its totient is φ = 2017392.

The previous prime is 2521733. The next prime is 2521747. The reversal of 2521745 is 5471252.

2521745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 1588²+1.

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 906304 + 1615441 = 952^2 + 1271^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521745 - 2⁶ = 2521681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2521747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252170 + ... + 252179.

It is an arithmetic number, because the mean of its divisors is an integer number (756525).

2^2521745 is an apocalyptic number.

It is an amenable number.

2521745 is a deficient number, since it is larger than the sum of its proper divisors (504355).

2521745 is an equidigital number, since it uses as much as digits as its factorization.

2521745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504354.

The product of its digits is 2800, while the sum is 26.

The square root of 2521745 is about 1588.0003148614. Note that the first 3 decimals coincide. The cubic root of 2521745 is about 136.1132454969.

Adding to 2521745 its reverse (5471252), we get a palindrome (7992997).

The spelling of 2521745 in words is "two million, five hundred twenty-one thousand, seven hundred forty-five".