85106591 has 2 divisors, whose sum is σ = 85106592. Its totient is φ = 85106590.

The previous prime is 85106579. The next prime is 85106597. The reversal of 85106591 is 19560158.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85106591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85106597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42553295 + 42553296.

It is an arithmetic number, because the mean of its divisors is an integer number (42553296).

Almost surely, 2^85106591 is an apocalyptic number.

85106591 is a deficient number, since it is larger than the sum of its proper divisors (1).

85106591 is an equidigital number, since it uses as much as digits as its factorization.

85106591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 85106591 is about 9225.3233547665. The cubic root of 85106591 is about 439.8666796492.

The spelling of 85106591 in words is "eighty-five million, one hundred six thousand, five hundred ninety-one".