81452575 has 6 divisors (see below), whose sum is σ = 101001224. Its totient is φ = 65162040.

The previous prime is 81452537. The next prime is 81452611. The reversal of 81452575 is 57525418.

It is not a de Polignac number, because 81452575 - 2⁷ = 81452447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1629027 + ... + 1629076.

Almost surely, 2^81452575 is an apocalyptic number.

81452575 is a deficient number, since it is larger than the sum of its proper divisors (19548649).

81452575 is a wasteful number, since it uses less digits than its factorization.

81452575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258113 (or 3258108 counting only the distinct ones).

The product of its digits is 56000, while the sum is 37.

The square root of 81452575 is about 9025.1080325944. The cubic root of 81452575 is about 433.4792095984.

The spelling of 81452575 in words is "eighty-one million, four hundred fifty-two thousand, five hundred seventy-five".