2557245391 has 2 divisors, whose sum is σ = 2557245392. Its totient is φ = 2557245390.

The previous prime is 2557245331. The next prime is 2557245413. The reversal of 2557245391 is 1935427552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2557245391 - 2⁷ = 2557245263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2557245331) by changing a digit.

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 as a sum of consecutive naturals, namely, 1278622695 + 1278622696.

It is an arithmetic number, because the mean of its divisors is an integer number (1278622696).

Almost surely, 2^2557245391 is an apocalyptic number.

2557245391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2557245391 is an equidigital number, since it uses as much as digits as its factorization.

2557245391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 43.

The square root of 2557245391 is about 50569.2138657504. The cubic root of 2557245391 is about 1367.4899234240.

The spelling of 2557245391 in words is "two billion, five hundred fifty-seven million, two hundred forty-five thousand, three hundred ninety-one".