81044170 has 16 divisors (see below), whose sum is σ = 148353120. Its totient is φ = 31867984.

The previous prime is 81044153. The next prime is 81044189. The reversal of 81044170 is 7144018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68092 + ... + 69271.

It is an arithmetic number, because the mean of its divisors is an integer number (9272070).

Almost surely, 2^81044170 is an apocalyptic number.

81044170 is a deficient number, since it is larger than the sum of its proper divisors (67308950).

81044170 is a wasteful number, since it uses less digits than its factorization.

81044170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137429.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 81044170 is about 9002.4535544484. The cubic root of 81044170 is about 432.7535039164.

Adding to 81044170 its reverse (7144018), we get a palindrome (88188188).

The spelling of 81044170 in words is "eighty-one million, forty-four thousand, one hundred seventy".