2521257889 has 2 divisors, whose sum is σ = 2521257890. Its totient is φ = 2521257888.

The previous prime is 2521257857. The next prime is 2521257899. The reversal of 2521257889 is 9887521252.

2521257889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1433379600 + 1087878289 = 37860^2 + 32983^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521257889 - 2⁵ = 2521257857 is a prime.

It is not a weakly prime, because it can be changed into another prime (2521257899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260628944 + 1260628945.

It is an arithmetic number, because the mean of its divisors is an integer number (1260628945).

Almost surely, 2^2521257889 is an apocalyptic number.

It is an amenable number.

2521257889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521257889 is an equidigital number, since it uses as much as digits as its factorization.

2521257889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 49.

The square root of 2521257889 is about 50212.1289032839. The cubic root of 2521257889 is about 1361.0448086125.

The spelling of 2521257889 in words is "two billion, five hundred twenty-one million, two hundred fifty-seven thousand, eight hundred eighty-nine".