81752441 has 4 divisors (see below), whose sum is σ = 81770832. Its totient is φ = 81734052.

The previous prime is 81752431. The next prime is 81752443. The reversal of 81752441 is 14425718.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14425718 = 2 ⋅7212859.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81752441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81752398 and 81752407.

It is not an unprimeable number, because it can be changed into a prime (81752443) 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, 2090 + ... + 12956.

It is an arithmetic number, because the mean of its divisors is an integer number (20442708).

Almost surely, 2^81752441 is an apocalyptic number.

It is an amenable number.

81752441 is a deficient number, since it is larger than the sum of its proper divisors (18391).

81752441 is a wasteful number, since it uses less digits than its factorization.

81752441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18390.

The product of its digits is 8960, while the sum is 32.

The square root of 81752441 is about 9041.7056466134. The cubic root of 81752441 is about 434.0105064457.

The spelling of 81752441 in words is "eighty-one million, seven hundred fifty-two thousand, four hundred forty-one".