85231281 has 16 divisors (see below), whose sum is σ = 115404800. Its totient is φ = 55945728.

The previous prime is 85231253. The next prime is 85231291. The reversal of 85231281 is 18213258.

It is not a de Polignac number, because 85231281 - 2¹⁵ = 85198513 is a prime.

It is a super-2 number, since 2×85231281² = 14528742521801922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85231231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66000 + ... + 67278.

It is an arithmetic number, because the mean of its divisors is an integer number (7212800).

Almost surely, 2^85231281 is an apocalyptic number.

It is an amenable number.

85231281 is a deficient number, since it is larger than the sum of its proper divisors (30173519).

85231281 is a wasteful number, since it uses less digits than its factorization.

85231281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608.

The product of its digits is 3840, while the sum is 30.

The square root of 85231281 is about 9232.0789099747. The cubic root of 85231281 is about 440.0813916236.

The spelling of 85231281 in words is "eighty-five million, two hundred thirty-one thousand, two hundred eighty-one".