81579369 has 8 divisors (see below), whose sum is σ = 114497440. Its totient is φ = 51523776.

The previous prime is 81579319. The next prime is 81579389. The reversal of 81579369 is 96397518.

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

It is not a de Polignac number, because 81579369 - 2⁹ = 81578857 is a prime.

It is a super-2 number, since 2×81579369² = 13310386892876322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81579319) 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, 715552 + ... + 715665.

It is an arithmetic number, because the mean of its divisors is an integer number (14312180).

Almost surely, 2^81579369 is an apocalyptic number.

It is an amenable number.

81579369 is a deficient number, since it is larger than the sum of its proper divisors (32918071).

81579369 is a wasteful number, since it uses less digits than its factorization.

81579369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431239.

The product of its digits is 408240, while the sum is 48.

The square root of 81579369 is about 9032.1298152761. The cubic root of 81579369 is about 433.7040196313.

The spelling of 81579369 in words is "eighty-one million, five hundred seventy-nine thousand, three hundred sixty-nine".