81452579 has 8 divisors (see below), whose sum is σ = 87879792. Its totient is φ = 75048480.

The previous prime is 81452537. The next prime is 81452611. The reversal of 81452579 is 97525418.

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

It is not a de Polignac number, because 81452579 - 2²⁰ = 80404003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81452519) 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, 1937 + ... + 12909.

It is an arithmetic number, because the mean of its divisors is an integer number (10984974).

Almost surely, 2^81452579 is an apocalyptic number.

81452579 is a deficient number, since it is larger than the sum of its proper divisors (6427213).

81452579 is a wasteful number, since it uses less digits than its factorization.

81452579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11557.

The product of its digits is 100800, while the sum is 41.

The square root of 81452579 is about 9025.1082541984. The cubic root of 81452579 is about 433.4792166943.

The spelling of 81452579 in words is "eighty-one million, four hundred fifty-two thousand, five hundred seventy-nine".