85729871 has 2 divisors, whose sum is σ = 85729872. Its totient is φ = 85729870.

The previous prime is 85729867. The next prime is 85729877. The reversal of 85729871 is 17892758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85729871 - 2² = 85729867 is a prime.

It is a super-2 number, since 2×85729871² = 14699221563353282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85729877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42864935 + 42864936.

It is an arithmetic number, because the mean of its divisors is an integer number (42864936).

Almost surely, 2^85729871 is an apocalyptic number.

85729871 is a deficient number, since it is larger than the sum of its proper divisors (1).

85729871 is an equidigital number, since it uses as much as digits as its factorization.

85729871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 47.

The square root of 85729871 is about 9259.0426610962. The cubic root of 85729871 is about 440.9378600680.

The spelling of 85729871 in words is "eighty-five million, seven hundred twenty-nine thousand, eight hundred seventy-one".