2521945 has 4 divisors (see below), whose sum is σ = 3026340. Its totient is φ = 2017552.

The previous prime is 2521921. The next prime is 2521949. The reversal of 2521945 is 5491252.

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 1968409 + 553536 = 1403^2 + 744^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521945 - 2⁷ = 2521817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2521949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252190 + ... + 252199.

It is an arithmetic number, because the mean of its divisors is an integer number (756585).

2^2521945 is an apocalyptic number.

It is an amenable number.

2521945 is a deficient number, since it is larger than the sum of its proper divisors (504395).

2521945 is an equidigital number, since it uses as much as digits as its factorization.

2521945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504394.

The product of its digits is 3600, while the sum is 28.

The square root of 2521945 is about 1588.0632858926. The cubic root of 2521945 is about 136.1168437896.

It can be divided in two parts, 252 and 1945, that added together give a cube (2197 = 13³).

The spelling of 2521945 in words is "two million, five hundred twenty-one thousand, nine hundred forty-five".