81452473 has 4 divisors (see below), whose sum is σ = 81540340. Its totient is φ = 81364608.

The previous prime is 81452461. The next prime is 81452477. The reversal of 81452473 is 37425418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37425418 = 2 ⋅18712709.

It can be written as a sum of positive squares in 2 ways, for example, as 10942864 + 70509609 = 3308^2 + 8397^2 .

It is a cyclic number.

It is not a de Polignac number, because 81452473 - 2⁹ = 81451961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81452477) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 42528 + ... + 44401.

It is an arithmetic number, because the mean of its divisors is an integer number (20385085).

Almost surely, 2^81452473 is an apocalyptic number.

It is an amenable number.

81452473 is a deficient number, since it is larger than the sum of its proper divisors (87867).

81452473 is an equidigital number, since it uses as much as digits as its factorization.

81452473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87866.

The product of its digits is 26880, while the sum is 34.

The square root of 81452473 is about 9025.1023816907. The cubic root of 81452473 is about 433.4790286551.

The spelling of 81452473 in words is "eighty-one million, four hundred fifty-two thousand, four hundred seventy-three".