81083293 has 4 divisors (see below), whose sum is σ = 81114748. Its totient is φ = 81051840.

The previous prime is 81083273. The next prime is 81083297. The reversal of 81083293 is 39238018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39238018 = 2 ⋅19619009.

It can be written as a sum of positive squares in 2 ways, for example, as 11410884 + 69672409 = 3378^2 + 8347^2 .

It is a cyclic number.

It is not a de Polignac number, because 81083293 - 2¹³ = 81075101 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 (81083297) 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, 11478 + ... + 17143.

It is an arithmetic number, because the mean of its divisors is an integer number (20278687).

Almost surely, 2^81083293 is an apocalyptic number.

It is an amenable number.

81083293 is a deficient number, since it is larger than the sum of its proper divisors (31455).

81083293 is a wasteful number, since it uses less digits than its factorization.

81083293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31454.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 81083293 is about 9004.6261999041. The cubic root of 81083293 is about 432.8231280556.

The spelling of 81083293 in words is "eighty-one million, eighty-three thousand, two hundred ninety-three".