81713325 has 24 divisors (see below), whose sum is σ = 135446688. Its totient is φ = 43468480.

The previous prime is 81713297. The next prime is 81713347. The reversal of 81713325 is 52331718.

It is not a de Polignac number, because 81713325 - 2⁸ = 81713069 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81713292 and 81713301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33859 + ... + 36191.

It is an arithmetic number, because the mean of its divisors is an integer number (5643612).

Almost surely, 2^81713325 is an apocalyptic number.

It is an amenable number.

81713325 is a deficient number, since it is larger than the sum of its proper divisors (53733363).

81713325 is a wasteful number, since it uses less digits than its factorization.

81713325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813 (or 2808 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 81713325 is about 9039.5423003601. The cubic root of 81713325 is about 433.9412752273.

The spelling of 81713325 in words is "eighty-one million, seven hundred thirteen thousand, three hundred twenty-five".