85017231 has 48 divisors (see below), whose sum is σ = 139426560. Its totient is φ = 49559040.

The previous prime is 85017211. The next prime is 85017239. The reversal of 85017231 is 13271058.

It is not a de Polignac number, because 85017231 - 2⁵ = 85017199 is a prime.

It is a super-2 number, since 2×85017231² = 14455859133814722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85017195 and 85017204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85017239) 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 47 ways as a sum of consecutive naturals, for example, 177250 + ... + 177728.

It is an arithmetic number, because the mean of its divisors is an integer number (2904720).

Almost surely, 2^85017231 is an apocalyptic number.

85017231 is a deficient number, since it is larger than the sum of its proper divisors (54409329).

85017231 is a wasteful number, since it uses less digits than its factorization.

85017231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 85017231 is about 9220.4788921183. The cubic root of 85017231 is about 439.7126757073.

Adding to 85017231 its reverse (13271058), we get a palindrome (98288289).

It can be divided in two parts, 850 and 17231, that added together give a palindrome (18081).

The spelling of 85017231 in words is "eighty-five million, seventeen thousand, two hundred thirty-one".