85919861 has 4 divisors (see below), whose sum is σ = 85948800. Its totient is φ = 85890924.

The previous prime is 85919851. The next prime is 85919863. The reversal of 85919861 is 16891958.

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: 16891958 = 2 ⋅8445979.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85919861 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 (85919863) 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, 9431 + ... + 16148.

It is an arithmetic number, because the mean of its divisors is an integer number (21487200).

Almost surely, 2^85919861 is an apocalyptic number.

It is an amenable number.

85919861 is a deficient number, since it is larger than the sum of its proper divisors (28939).

85919861 is a wasteful number, since it uses less digits than its factorization.

85919861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28938.

The product of its digits is 155520, while the sum is 47.

The square root of 85919861 is about 9269.2966831362. The cubic root of 85919861 is about 441.2633474550.

The spelling of 85919861 in words is "eighty-five million, nine hundred nineteen thousand, eight hundred sixty-one".