85017281 has 4 divisors (see below), whose sum is σ = 85051332. Its totient is φ = 84983232.

The previous prime is 85017277. The next prime is 85017287. The reversal of 85017281 is 18271058.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82719025 + 2298256 = 9095^2 + 1516^2 .

It is a cyclic number.

It is not a de Polignac number, because 85017281 - 2² = 85017277 is a prime.

It is a super-2 number, since 2×85017281² = 14455876137265922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85017287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12956 + ... + 18381.

It is an arithmetic number, because the mean of its divisors is an integer number (21262833).

Almost surely, 2^85017281 is an apocalyptic number.

It is an amenable number.

85017281 is a deficient number, since it is larger than the sum of its proper divisors (34051).

85017281 is a wasteful number, since it uses less digits than its factorization.

85017281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34050.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 85017281 is about 9220.4816034739. The cubic root of 85017281 is about 439.7127619080.

The spelling of 85017281 in words is "eighty-five million, seventeen thousand, two hundred eighty-one".