81044325 has 18 divisors (see below), whose sum is σ = 145159794. Its totient is φ = 43223520.

The previous prime is 81044317. The next prime is 81044333. The reversal of 81044325 is 52344018.

It is an interprime number because it is at equal distance from previous prime (81044317) and next prime (81044333).

It can be written as a sum of positive squares in 3 ways, for example, as 1602756 + 79441569 = 1266^2 + 8913^2 .

It is not a de Polignac number, because 81044325 - 2³ = 81044317 is a prime.

It is a super-2 number, since 2×81044325² = 13136365229411250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 179874 + ... + 180323.

It is an arithmetic number, because the mean of its divisors is an integer number (8064433).

Almost surely, 2^81044325 is an apocalyptic number.

It is an amenable number.

81044325 is a deficient number, since it is larger than the sum of its proper divisors (64115469).

81044325 is a wasteful number, since it uses less digits than its factorization.

81044325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360213 (or 360205 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 81044325 is about 9002.4621632085. The cubic root of 81044325 is about 432.7537798019.

The spelling of 81044325 in words is "eighty-one million, forty-four thousand, three hundred twenty-five".