1125806857 has 4 divisors (see below), whose sum is σ = 1286636416. Its totient is φ = 964977300.

The previous prime is 1125806833. The next prime is 1125806863. The reversal of 1125806857 is 7586085211.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7586085211 = 83 ⋅91398617.

It is not a de Polignac number, because 1125806857 - 2¹⁹ = 1125282569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125800857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80414769 + ... + 80414782.

It is an arithmetic number, because the mean of its divisors is an integer number (321659104).

Almost surely, 2^1125806857 is an apocalyptic number.

It is an amenable number.

1125806857 is a deficient number, since it is larger than the sum of its proper divisors (160829559).

1125806857 is an equidigital number, since it uses as much as digits as its factorization.

1125806857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160829558.

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

The square root of 1125806857 is about 33553.0454206470. The cubic root of 1125806857 is about 1040.2904936173.

The spelling of 1125806857 in words is "one billion, one hundred twenty-five million, eight hundred six thousand, eight hundred fifty-seven".