81427543 has 2 divisors, whose sum is σ = 81427544. Its totient is φ = 81427542.

The previous prime is 81427531. The next prime is 81427583. The reversal of 81427543 is 34572418.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81427543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81427499 and 81427508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81427583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40713771 + 40713772.

It is an arithmetic number, because the mean of its divisors is an integer number (40713772).

Almost surely, 2^81427543 is an apocalyptic number.

81427543 is a deficient number, since it is larger than the sum of its proper divisors (1).

81427543 is an equidigital number, since it uses as much as digits as its factorization.

81427543 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 81427543 is about 9023.7211282264. The cubic root of 81427543 is about 433.4347994480.

The spelling of 81427543 in words is "eighty-one million, four hundred twenty-seven thousand, five hundred forty-three".