85231971 has 12 divisors (see below), whose sum is σ = 134305080. Its totient is φ = 51655680.

The previous prime is 85231969. The next prime is 85231987. The reversal of 85231971 is 17913258.

It is not a de Polignac number, because 85231971 - 2¹ = 85231969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85231921) 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 11 ways as a sum of consecutive naturals, for example, 430366 + ... + 430563.

It is an arithmetic number, because the mean of its divisors is an integer number (11192090).

Almost surely, 2^85231971 is an apocalyptic number.

85231971 is a deficient number, since it is larger than the sum of its proper divisors (49073109).

85231971 is a wasteful number, since it uses less digits than its factorization.

85231971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860946 (or 860943 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 85231971 is about 9232.1162795970. The cubic root of 85231971 is about 440.0825791975.

It can be divided in two parts, 852 and 31971, that added together give a palindrome (32823).

The spelling of 85231971 in words is "eighty-five million, two hundred thirty-one thousand, nine hundred seventy-one".