81044217 has 12 divisors (see below), whose sum is σ = 117227604. Its totient is φ = 53953920.

The previous prime is 81044213. The next prime is 81044231. The reversal of 81044217 is 71244018.

It can be written as a sum of positive squares in 2 ways, for example, as 32936121 + 48108096 = 5739^2 + 6936^2 .

It is not a de Polignac number, because 81044217 - 2² = 81044213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81044213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 933 + ... + 12765.

It is an arithmetic number, because the mean of its divisors is an integer number (9768967).

Almost surely, 2^81044217 is an apocalyptic number.

It is an amenable number.

81044217 is a deficient number, since it is larger than the sum of its proper divisors (36183387).

81044217 is a wasteful number, since it uses less digits than its factorization.

81044217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12600 (or 12597 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 81044217 is about 9002.4561648475. The cubic root of 81044217 is about 432.7535875720.

It can be divided in two parts, 8104 and 4217, that added together give a palindrome (12321).

The spelling of 81044217 in words is "eighty-one million, forty-four thousand, two hundred seventeen".