81044377 has 4 divisors (see below), whose sum is σ = 81187380. Its totient is φ = 80901376.

The previous prime is 81044371. The next prime is 81044399. The reversal of 81044377 is 77344018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77344018 = 2 ⋅38672009.

It can be written as a sum of positive squares in 2 ways, for example, as 38390416 + 42653961 = 6196^2 + 6531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81044377 is a prime.

It is a super-3 number, since 3×81044377³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81044371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70648 + ... + 71785.

It is an arithmetic number, because the mean of its divisors is an integer number (20296845).

Almost surely, 2^81044377 is an apocalyptic number.

It is an amenable number.

81044377 is a deficient number, since it is larger than the sum of its proper divisors (143003).

81044377 is a wasteful number, since it uses less digits than its factorization.

81044377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143002.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 81044377 is about 9002.4650513068. The cubic root of 81044377 is about 432.7538723570.

The spelling of 81044377 in words is "eighty-one million, forty-four thousand, three hundred seventy-seven".