85756591 has 4 divisors (see below), whose sum is σ = 85903272. Its totient is φ = 85609912.

The previous prime is 85756553. The next prime is 85756609. The reversal of 85756591 is 19565758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19565758 = 2 ⋅9782879.

It is a cyclic number.

It is not a de Polignac number, because 85756591 - 2²¹ = 83659439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85756511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72460 + ... + 73633.

It is an arithmetic number, because the mean of its divisors is an integer number (21475818).

Almost surely, 2^85756591 is an apocalyptic number.

85756591 is a deficient number, since it is larger than the sum of its proper divisors (146681).

85756591 is a wasteful number, since it uses less digits than its factorization.

85756591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146680.

The product of its digits is 378000, while the sum is 46.

The square root of 85756591 is about 9260.4854624366. The cubic root of 85756591 is about 440.9836653229.

The spelling of 85756591 in words is "eighty-five million, seven hundred fifty-six thousand, five hundred ninety-one".