2521454545 has 4 divisors (see below), whose sum is σ = 3025745460. Its totient is φ = 2017163632.

The previous prime is 2521454539. The next prime is 2521454567. The reversal of 2521454545 is 5454541252.

2521454545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1120374784 + 1401079761 = 33472^2 + 37431^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521454545 - 2⁵ = 2521454513 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252145450 + ... + 252145459.

It is an arithmetic number, because the mean of its divisors is an integer number (756436365).

Almost surely, 2^2521454545 is an apocalyptic number.

It is an amenable number.

2521454545 is a deficient number, since it is larger than the sum of its proper divisors (504290915).

2521454545 is an equidigital number, since it uses as much as digits as its factorization.

2521454545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504290914.

The product of its digits is 160000, while the sum is 37.

The square root of 2521454545 is about 50214.0871170631. The cubic root of 2521454545 is about 1361.0801944769.

Adding to 2521454545 its reverse (5454541252), we get a palindrome (7975995797).

The spelling of 2521454545 in words is "two billion, five hundred twenty-one million, four hundred fifty-four thousand, five hundred forty-five".