81579353 has 4 divisors (see below), whose sum is σ = 81814800. Its totient is φ = 81343908.

The previous prime is 81579319. The next prime is 81579389. The reversal of 81579353 is 35397518.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81579353 - 2¹⁴ = 81562969 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 81579353.

It is not an unprimeable number, because it can be changed into a prime (81579313) 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, 117203 + ... + 117896.

It is an arithmetic number, because the mean of its divisors is an integer number (20453700).

Almost surely, 2^81579353 is an apocalyptic number.

It is an amenable number.

81579353 is a deficient number, since it is larger than the sum of its proper divisors (235447).

81579353 is a wasteful number, since it uses less digits than its factorization.

81579353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235446.

The product of its digits is 113400, while the sum is 41.

The square root of 81579353 is about 9032.1289295492. The cubic root of 81579353 is about 433.7039912775.

The spelling of 81579353 in words is "eighty-one million, five hundred seventy-nine thousand, three hundred fifty-three".