85729591 has 2 divisors, whose sum is σ = 85729592. Its totient is φ = 85729590.

The previous prime is 85729549. The next prime is 85729603. The reversal of 85729591 is 19592758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85729591 - 2¹⁵ = 85696823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85727591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42864795 + 42864796.

It is an arithmetic number, because the mean of its divisors is an integer number (42864796).

Almost surely, 2^85729591 is an apocalyptic number.

85729591 is a deficient number, since it is larger than the sum of its proper divisors (1).

85729591 is an equidigital number, since it uses as much as digits as its factorization.

85729591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 46.

The square root of 85729591 is about 9259.0275407302. The cubic root of 85729591 is about 440.9373800224.

It can be divided in two parts, 85729 and 591, that added together give a triangular number (86320 = T₄₁₅).

The spelling of 85729591 in words is "eighty-five million, seven hundred twenty-nine thousand, five hundred ninety-one".