2525242721 has 2 divisors, whose sum is σ = 2525242722. Its totient is φ = 2525242720.

The previous prime is 2525242669. The next prime is 2525242739. The reversal of 2525242721 is 1272425252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2196328225 + 328914496 = 46865^2 + 18136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2525242721 is a prime.

It is not a weakly prime, because it can be changed into another prime (2525242751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1262621360 + 1262621361.

It is an arithmetic number, because the mean of its divisors is an integer number (1262621361).

Almost surely, 2^2525242721 is an apocalyptic number.

It is an amenable number.

2525242721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2525242721 is an equidigital number, since it uses as much as digits as its factorization.

2525242721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 32.

The square root of 2525242721 is about 50251.7932117850. The cubic root of 2525242721 is about 1361.7614720618.

Adding to 2525242721 its reverse (1272425252), we get a palindrome (3797667973).

The spelling of 2525242721 in words is "two billion, five hundred twenty-five million, two hundred forty-two thousand, seven hundred twenty-one".