85661393 has 4 divisors (see below), whose sum is σ = 85693860. Its totient is φ = 85628928.

The previous prime is 85661377. The next prime is 85661413. The reversal of 85661393 is 39316658.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25877569 + 59783824 = 5087^2 + 7732^2 .

It is a cyclic number.

It is not a de Polignac number, because 85661393 - 2⁴ = 85661377 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 85661393.

It is not an unprimeable number, because it can be changed into a prime (85661353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11888 + ... + 17681.

It is an arithmetic number, because the mean of its divisors is an integer number (21423465).

Almost surely, 2^85661393 is an apocalyptic number.

It is an amenable number.

85661393 is a deficient number, since it is larger than the sum of its proper divisors (32467).

85661393 is a wasteful number, since it uses less digits than its factorization.

85661393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32466.

The product of its digits is 116640, while the sum is 41.

The square root of 85661393 is about 9255.3440238599. The cubic root of 85661393 is about 440.8204269203.

The spelling of 85661393 in words is "eighty-five million, six hundred sixty-one thousand, three hundred ninety-three".