82191725 has 24 divisors (see below), whose sum is σ = 127069248. Its totient is φ = 51235200.

The previous prime is 82191721. The next prime is 82191737. The reversal of 82191725 is 52719128.

It is not a de Polignac number, because 82191725 - 2² = 82191721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82191721) 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, 19424 + ... + 23273.

It is an arithmetic number, because the mean of its divisors is an integer number (5294552).

Almost surely, 2^82191725 is an apocalyptic number.

It is an amenable number.

82191725 is a deficient number, since it is larger than the sum of its proper divisors (44877523).

82191725 is a wasteful number, since it uses less digits than its factorization.

82191725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42725 (or 42720 counting only the distinct ones).

The product of its digits is 10080, while the sum is 35.

The square root of 82191725 is about 9065.9651995802. The cubic root of 82191725 is about 434.7864808459.

The spelling of 82191725 in words is "eighty-two million, one hundred ninety-one thousand, seven hundred twenty-five".