81000343 has 2 divisors, whose sum is σ = 81000344. Its totient is φ = 81000342.

The previous prime is 81000323. The next prime is 81000371. The reversal of 81000343 is 34300018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81000343 - 2¹³ = 80992151 is a prime.

It is a super-2 number, since 2×81000343² = 13122111132235298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81000343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81000323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40500171 + 40500172.

It is an arithmetic number, because the mean of its divisors is an integer number (40500172).

Almost surely, 2^81000343 is an apocalyptic number.

81000343 is a deficient number, since it is larger than the sum of its proper divisors (1).

81000343 is an equidigital number, since it uses as much as digits as its factorization.

81000343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 81000343 is about 9000.0190555354. The cubic root of 81000343 is about 432.6754818217.

The spelling of 81000343 in words is "eighty-one million, three hundred forty-three", and thus it is an aban number.