81752443 has 2 divisors, whose sum is σ = 81752444. Its totient is φ = 81752442.

The previous prime is 81752431. The next prime is 81752467. The reversal of 81752443 is 34425718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81752443 - 2⁹ = 81751931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81752399 and 81752408.

It is not a weakly prime, because it can be changed into another prime (81752413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40876221 + 40876222.

It is an arithmetic number, because the mean of its divisors is an integer number (40876222).

Almost surely, 2^81752443 is an apocalyptic number.

81752443 is a deficient number, since it is larger than the sum of its proper divisors (1).

81752443 is an equidigital number, since it uses as much as digits as its factorization.

81752443 is an evil number, because the sum of its binary digits is even.

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

The square root of 81752443 is about 9041.7057572120. The cubic root of 81752443 is about 434.0105099850.

The spelling of 81752443 in words is "eighty-one million, seven hundred fifty-two thousand, four hundred forty-three".