81368743 has 2 divisors, whose sum is σ = 81368744. Its totient is φ = 81368742.

The previous prime is 81368719. The next prime is 81368761. The reversal of 81368743 is 34786318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81368743 - 2⁵ = 81368711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81368696 and 81368705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81368713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40684371 + 40684372.

It is an arithmetic number, because the mean of its divisors is an integer number (40684372).

Almost surely, 2^81368743 is an apocalyptic number.

81368743 is a deficient number, since it is larger than the sum of its proper divisors (1).

81368743 is an equidigital number, since it uses as much as digits as its factorization.

81368743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 81368743 is about 9020.4624604285. The cubic root of 81368743 is about 433.3304444909.

The spelling of 81368743 in words is "eighty-one million, three hundred sixty-eight thousand, seven hundred forty-three".