81755325 has 60 divisors (see below), whose sum is σ = 154841280. Its totient is φ = 42625440.

The previous prime is 81755281. The next prime is 81755357. The reversal of 81755325 is 52355718.

81755325 is a `hidden beast` number, since 81 + 7 + 553 + 25 = 666.

It is not a de Polignac number, because 81755325 - 2¹⁰ = 81754301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81755325.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 94746 + ... + 95604.

It is an arithmetic number, because the mean of its divisors is an integer number (2580688).

Almost surely, 2^81755325 is an apocalyptic number.

It is an amenable number.

81755325 is a deficient number, since it is larger than the sum of its proper divisors (73085955).

81755325 is a wasteful number, since it uses less digits than its factorization.

81755325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928 (or 914 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 81755325 is about 9041.8651283903. The cubic root of 81755325 is about 434.0156099491.

The spelling of 81755325 in words is "eighty-one million, seven hundred fifty-five thousand, three hundred twenty-five".