8191725 has 24 divisors (see below), whose sum is σ = 13630080. Its totient is φ = 4341120.

The previous prime is 8191699. The next prime is 8191727. The reversal of 8191725 is 5271918.

8191725 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8191725 - 2¹⁰ = 8190701 is a prime.

8191725 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8191727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17697 + ... + 18153.

It is an arithmetic number, because the mean of its divisors is an integer number (567920).

Almost surely, 2^8191725 is an apocalyptic number.

It is an amenable number.

8191725 is a deficient number, since it is larger than the sum of its proper divisors (5438355).

8191725 is a wasteful number, since it uses less digits than its factorization.

8191725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 704 counting only the distinct ones).

The product of its digits is 5040, while the sum is 33.

The square root of 8191725 is about 2862.1189702736. The cubic root of 8191725 is about 201.5851122399.

It can be divided in two parts, 81 and 91725, that added together give a triangular number (91806 = T₄₂₈).

The spelling of 8191725 in words is "eight million, one hundred ninety-one thousand, seven hundred twenty-five".