2542721245 has 4 divisors (see below), whose sum is σ = 3051265500. Its totient is φ = 2034176992.

The previous prime is 2542721191. The next prime is 2542721257. The reversal of 2542721245 is 5421272452.

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 690796089 + 1851925156 = 26283^2 + 43034^2 .

It is a cyclic number.

It is not a de Polignac number, because 2542721245 - 2⁷ = 2542721117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2542721245.

It is a congruent number.

It is an unprimeable number.

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, 254272120 + ... + 254272129.

It is an arithmetic number, because the mean of its divisors is an integer number (762816375).

Almost surely, 2^2542721245 is an apocalyptic number.

It is an amenable number.

2542721245 is a deficient number, since it is larger than the sum of its proper divisors (508544255).

2542721245 is an equidigital number, since it uses as much as digits as its factorization.

2542721245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508544254.

The product of its digits is 44800, while the sum is 34.

The square root of 2542721245 is about 50425.4027747920. The cubic root of 2542721245 is about 1364.8960719131.

Adding to 2542721245 its reverse (5421272452), we get a palindrome (7963993697).

The spelling of 2542721245 in words is "two billion, five hundred forty-two million, seven hundred twenty-one thousand, two hundred forty-five".