81344293 has 8 divisors (see below), whose sum is σ = 83416536. Its totient is φ = 79296000.

The previous prime is 81344281. The next prime is 81344299. The reversal of 81344293 is 39244318.

It can be written as a sum of positive squares in 4 ways, for example, as 3869089 + 77475204 = 1967^2 + 8802^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81344293 - 2¹⁷ = 81213221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81344299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 993 + ... + 12793.

It is an arithmetic number, because the mean of its divisors is an integer number (10427067).

Almost surely, 2^81344293 is an apocalyptic number.

It is an amenable number.

81344293 is a deficient number, since it is larger than the sum of its proper divisors (2072243).

81344293 is a wasteful number, since it uses less digits than its factorization.

81344293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11975.

The product of its digits is 20736, while the sum is 34.

The square root of 81344293 is about 9019.1071065821. The cubic root of 81344293 is about 433.2870371974.

The spelling of 81344293 in words is "eighty-one million, three hundred forty-four thousand, two hundred ninety-three".