1025816857 has 4 divisors (see below), whose sum is σ = 1104725860. Its totient is φ = 946907856.

The previous prime is 1025816819. The next prime is 1025816863. The reversal of 1025816857 is 7586185201.

1025816857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 397763136 + 628053721 = 19944^2 + 25061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025816857 - 2²⁷ = 891599129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025816867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39454482 + ... + 39454507.

It is an arithmetic number, because the mean of its divisors is an integer number (276181465).

Almost surely, 2^1025816857 is an apocalyptic number.

It is an amenable number.

1025816857 is a deficient number, since it is larger than the sum of its proper divisors (78909003).

1025816857 is an equidigital number, since it uses as much as digits as its factorization.

1025816857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78909002.

The product of its (nonzero) digits is 134400, while the sum is 43.

The square root of 1025816857 is about 32028.3758095849. The cubic root of 1025816857 is about 1008.5326065522.

The spelling of 1025816857 in words is "one billion, twenty-five million, eight hundred sixteen thousand, eight hundred fifty-seven".