81343711 has 4 divisors (see below), whose sum is σ = 82878552. Its totient is φ = 79808872.

The previous prime is 81343697. The next prime is 81343733. The reversal of 81343711 is 11734318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81343711 - 2⁵ = 81343679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81343711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81343771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767341 + ... + 767446.

It is an arithmetic number, because the mean of its divisors is an integer number (20719638).

Almost surely, 2^81343711 is an apocalyptic number.

81343711 is a deficient number, since it is larger than the sum of its proper divisors (1534841).

81343711 is a wasteful number, since it uses less digits than its factorization.

81343711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534840.

The product of its digits is 2016, while the sum is 28.

The square root of 81343711 is about 9019.0748416897. The cubic root of 81343711 is about 433.2860038380.

The spelling of 81343711 in words is "eighty-one million, three hundred forty-three thousand, seven hundred eleven".