81140743 has 2 divisors, whose sum is σ = 81140744. Its totient is φ = 81140742.

The previous prime is 81140729. The next prime is 81140747. The reversal of 81140743 is 34704118.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81140743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81140747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40570371 + 40570372.

It is an arithmetic number, because the mean of its divisors is an integer number (40570372).

Almost surely, 2^81140743 is an apocalyptic number.

81140743 is a deficient number, since it is larger than the sum of its proper divisors (1).

81140743 is an equidigital number, since it uses as much as digits as its factorization.

81140743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 81140743 is about 9007.8156619682. The cubic root of 81140743 is about 432.9253267428.

The spelling of 81140743 in words is "eighty-one million, one hundred forty thousand, seven hundred forty-three".