81575743 has 2 divisors, whose sum is σ = 81575744. Its totient is φ = 81575742.

The previous prime is 81575737. The next prime is 81575761. The reversal of 81575743 is 34757518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81575743 - 2²¹ = 79478591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81575696 and 81575705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81575723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40787871 + 40787872.

It is an arithmetic number, because the mean of its divisors is an integer number (40787872).

Almost surely, 2^81575743 is an apocalyptic number.

81575743 is a deficient number, since it is larger than the sum of its proper divisors (1).

81575743 is an equidigital number, since it uses as much as digits as its factorization.

81575743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 40.

The square root of 81575743 is about 9031.9290851955. The cubic root of 81575743 is about 433.6975938479.

It can be divided in two parts, 8 and 1575743, that added together give a palindrome (1575751).

The spelling of 81575743 in words is "eighty-one million, five hundred seventy-five thousand, seven hundred forty-three".