81475 has 6 divisors (see below), whose sum is σ = 101060. Its totient is φ = 65160.

The previous prime is 81463. The next prime is 81509. The reversal of 81475 is 57418.

It is not a de Polignac number, because 81475 - 2⁹ = 80963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 3259 = 81475 / (8 + 1 + 4 + 7 + 5).

81475 is a lucky number.

It is a plaindrome in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1605 + ... + 1654.

2⁸¹⁴⁷⁵ is an apocalyptic number.

81475 is a deficient number, since it is larger than the sum of its proper divisors (19585).

81475 is a wasteful number, since it uses less digits than its factorization.

81475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3269 (or 3264 counting only the distinct ones).

The product of its digits is 1120, while the sum is 25.

The square root of 81475 is about 285.4382595238. The cubic root of 81475 is about 43.3518986853.

The spelling of 81475 in words is "eighty-one thousand, four hundred seventy-five".