81445079 has 8 divisors (see below), whose sum is σ = 89210160. Its totient is φ = 74010496.

The previous prime is 81445073. The next prime is 81445109. The reversal of 81445079 is 97054418.

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 81445079 - 2⁸ = 81444823 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 (81445073) 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, 82109 + ... + 83094.

It is an arithmetic number, because the mean of its divisors is an integer number (11151270).

Almost surely, 2^81445079 is an apocalyptic number.

81445079 is a deficient number, since it is larger than the sum of its proper divisors (7765081).

81445079 is a wasteful number, since it uses less digits than its factorization.

81445079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165249.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 81445079 is about 9024.6927371518. The cubic root of 81445079 is about 433.4659116360.

The spelling of 81445079 in words is "eighty-one million, four hundred forty-five thousand, seventy-nine".