8125891 has 4 divisors (see below), whose sum is σ = 8140552. Its totient is φ = 8111232.

The previous prime is 8125883. The next prime is 8125921. The reversal of 8125891 is 1985218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1985218 = 2 ⋅992609.

It is a cyclic number.

It is not a de Polignac number, because 8125891 - 2³ = 8125883 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8125811) 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, 6465 + ... + 7618.

It is an arithmetic number, because the mean of its divisors is an integer number (2035138).

Almost surely, 2^8125891 is an apocalyptic number.

8125891 is a deficient number, since it is larger than the sum of its proper divisors (14661).

8125891 is a wasteful number, since it uses less digits than its factorization.

8125891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14660.

The product of its digits is 5760, while the sum is 34.

The square root of 8125891 is about 2850.5948502023. The cubic root of 8125891 is about 201.0436363104.

The spelling of 8125891 in words is "eight million, one hundred twenty-five thousand, eight hundred ninety-one".