81367943 has 2 divisors, whose sum is σ = 81367944. Its totient is φ = 81367942.

The previous prime is 81367931. The next prime is 81367981. The reversal of 81367943 is 34976318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81367943 - 2¹² = 81363847 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81367943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81367043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40683971 + 40683972.

It is an arithmetic number, because the mean of its divisors is an integer number (40683972).

Almost surely, 2^81367943 is an apocalyptic number.

81367943 is a deficient number, since it is larger than the sum of its proper divisors (1).

81367943 is an equidigital number, since it uses as much as digits as its factorization.

81367943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 81367943 is about 9020.4181166950. The cubic root of 81367943 is about 433.3290243490.

The spelling of 81367943 in words is "eighty-one million, three hundred sixty-seven thousand, nine hundred forty-three".