81343667 has 4 divisors (see below), whose sum is σ = 81366000. Its totient is φ = 81321336.

The previous prime is 81343621. The next prime is 81343673. The reversal of 81343667 is 76634318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76634318 = 2 ⋅38317159.

It is a cyclic number.

It is not a de Polignac number, because 81343667 - 2¹² = 81339571 is a prime.

It is a super-2 number, since 2×81343667² = 13233584322013778, which contains 22 as substring.

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 81343667.

It is not an unprimeable number, because it can be changed into a prime (81343607) 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, 4292 + ... + 13457.

It is an arithmetic number, because the mean of its divisors is an integer number (20341500).

Almost surely, 2^81343667 is an apocalyptic number.

81343667 is a deficient number, since it is larger than the sum of its proper divisors (22333).

81343667 is a wasteful number, since it uses less digits than its factorization.

81343667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22332.

The product of its digits is 72576, while the sum is 38.

The square root of 81343667 is about 9019.0724024148. The cubic root of 81343667 is about 433.2859257144.

The spelling of 81343667 in words is "eighty-one million, three hundred forty-three thousand, six hundred sixty-seven".