81150085 has 8 divisors (see below), whose sum is σ = 98714520. Its totient is φ = 64030464.

The previous prime is 81150023. The next prime is 81150107. The reversal of 81150085 is 58005118.

It can be written as a sum of positive squares in 4 ways, for example, as 7568001 + 73582084 = 2751^2 + 8578^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81150085 - 2¹¹ = 81148037 is a prime.

It is a congruent number.

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, 110800 + ... + 111529.

It is an arithmetic number, because the mean of its divisors is an integer number (12339315).

Almost surely, 2^81150085 is an apocalyptic number.

It is an amenable number.

81150085 is a deficient number, since it is larger than the sum of its proper divisors (17564435).

81150085 is a wasteful number, since it uses less digits than its factorization.

81150085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222407.

The product of its (nonzero) digits is 1600, while the sum is 28.

The square root of 81150085 is about 9008.3341967314. The cubic root of 81150085 is about 432.9419408097.

The spelling of 81150085 in words is "eighty-one million, one hundred fifty thousand, eighty-five".