81335375 has 32 divisors (see below), whose sum is σ = 111758400. Its totient is φ = 58608000.

The previous prime is 81335363. The next prime is 81335381. The reversal of 81335375 is 57353318.

It is not a de Polignac number, because 81335375 - 2²⁴ = 64558159 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204677 + ... + 205073.

It is an arithmetic number, because the mean of its divisors is an integer number (3492450).

Almost surely, 2^81335375 is an apocalyptic number.

81335375 is a deficient number, since it is larger than the sum of its proper divisors (30423025).

81335375 is a wasteful number, since it uses less digits than its factorization.

81335375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 562 counting only the distinct ones).

The product of its digits is 37800, while the sum is 35.

The square root of 81335375 is about 9018.6126981926. The cubic root of 81335375 is about 433.2712024663.

The spelling of 81335375 in words is "eighty-one million, three hundred thirty-five thousand, three hundred seventy-five".