81044375 has 10 divisors (see below), whose sum is σ = 101273832. Its totient is φ = 64835000.

The previous prime is 81044371. The next prime is 81044399. The reversal of 81044375 is 57344018.

It is not a de Polignac number, because 81044375 - 2² = 81044371 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 (81044371) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 64211 + ... + 65460.

Almost surely, 2^81044375 is an apocalyptic number.

81044375 is a deficient number, since it is larger than the sum of its proper divisors (20229457).

81044375 is an equidigital number, since it uses as much as digits as its factorization.

81044375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129691 (or 129676 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 81044375 is about 9002.4649402261. The cubic root of 81044375 is about 432.7538687972.

The spelling of 81044375 in words is "eighty-one million, forty-four thousand, three hundred seventy-five".