1025268857 has 4 divisors (see below), whose sum is σ = 1047083136. Its totient is φ = 1003454580.

The previous prime is 1025268781. The next prime is 1025268863. The reversal of 1025268857 is 7588625201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1025268857 - 2²⁸ = 756833401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025238857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10907069 + ... + 10907162.

It is an arithmetic number, because the mean of its divisors is an integer number (261770784).

Almost surely, 2^1025268857 is an apocalyptic number.

It is an amenable number.

1025268857 is a deficient number, since it is larger than the sum of its proper divisors (21814279).

1025268857 is an equidigital number, since it uses as much as digits as its factorization.

1025268857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21814278.

The product of its (nonzero) digits is 268800, while the sum is 44.

The square root of 1025268857 is about 32019.8197527719. The cubic root of 1025268857 is about 1008.3529856941.

The spelling of 1025268857 in words is "one billion, twenty-five million, two hundred sixty-eight thousand, eight hundred fifty-seven".