85871251 has 2 divisors, whose sum is σ = 85871252. Its totient is φ = 85871250.

The previous prime is 85871243. The next prime is 85871263. The reversal of 85871251 is 15217858.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85871251 - 2³ = 85871243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85871251.

It is not a weakly prime, because it can be changed into another prime (85871231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42935625 + 42935626.

It is an arithmetic number, because the mean of its divisors is an integer number (42935626).

Almost surely, 2^85871251 is an apocalyptic number.

85871251 is a deficient number, since it is larger than the sum of its proper divisors (1).

85871251 is an equidigital number, since it uses as much as digits as its factorization.

85871251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 37.

The square root of 85871251 is about 9266.6742146252. The cubic root of 85871251 is about 441.1801154080.

The spelling of 85871251 in words is "eighty-five million, eight hundred seventy-one thousand, two hundred fifty-one".