81575355 has 8 divisors (see below), whose sum is σ = 130520592. Its totient is φ = 43506848.

The previous prime is 81575339. The next prime is 81575359. The reversal of 81575355 is 55357518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81575355 - 2⁴ = 81575339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81575359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2719164 + ... + 2719193.

It is an arithmetic number, because the mean of its divisors is an integer number (16315074).

Almost surely, 2^81575355 is an apocalyptic number.

81575355 is a deficient number, since it is larger than the sum of its proper divisors (48945237).

81575355 is a wasteful number, since it uses less digits than its factorization.

81575355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5438365.

The product of its digits is 105000, while the sum is 39.

The square root of 81575355 is about 9031.9076058162. The cubic root of 81575355 is about 433.6969062459.

The spelling of 81575355 in words is "eighty-one million, five hundred seventy-five thousand, three hundred fifty-five".