85591261 has 4 divisors (see below), whose sum is σ = 97818592. Its totient is φ = 73363932.

The previous prime is 85591213. The next prime is 85591271. The reversal of 85591261 is 16219558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16219558 = 2 ⋅8109779.

It is a cyclic number.

It is not a de Polignac number, because 85591261 - 2⁷ = 85591133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85591261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85591271) 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, 6113655 + ... + 6113668.

It is an arithmetic number, because the mean of its divisors is an integer number (24454648).

Almost surely, 2^85591261 is an apocalyptic number.

It is an amenable number.

85591261 is a deficient number, since it is larger than the sum of its proper divisors (12227331).

85591261 is a wasteful number, since it uses less digits than its factorization.

85591261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12227330.

The product of its digits is 21600, while the sum is 37.

The square root of 85591261 is about 9251.5545180256. The cubic root of 85591261 is about 440.7000924346.

The spelling of 85591261 in words is "eighty-five million, five hundred ninety-one thousand, two hundred sixty-one".