8191125 has 40 divisors (see below), whose sum is σ = 15289560. Its totient is φ = 4363200.

The previous prime is 8191123. The next prime is 8191129. The reversal of 8191125 is 5211918.

It can be written as a sum of positive squares in 4 ways, for example, as 81 + 8191044 = 9^2 + 2862^2 .

It is not a de Polignac number, because 8191125 - 2¹ = 8191123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8191123) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9721 + ... + 10529.

It is an arithmetic number, because the mean of its divisors is an integer number (382239).

Almost surely, 2^8191125 is an apocalyptic number.

It is an amenable number.

8191125 is a deficient number, since it is larger than the sum of its proper divisors (7098435).

8191125 is an equidigital number, since it uses as much as digits as its factorization.

8191125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836 (or 817 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 8191125 is about 2862.0141509084. The cubic root of 8191125 is about 201.5801904430.

The spelling of 8191125 in words is "eight million, one hundred ninety-one thousand, one hundred twenty-five".