85909919 has 4 divisors (see below), whose sum is σ = 88872360. Its totient is φ = 82947480.

The previous prime is 85909903. The next prime is 85909933. The reversal of 85909919 is 91990958.

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

It is a cyclic number.

It is not a de Polignac number, because 85909919 - 2⁴ = 85909903 is a prime.

It is a super-2 number, since 2×85909919² = 14761028365173122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85909939) 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, 1481177 + ... + 1481234.

It is an arithmetic number, because the mean of its divisors is an integer number (22218090).

Almost surely, 2^85909919 is an apocalyptic number.

85909919 is a deficient number, since it is larger than the sum of its proper divisors (2962441).

85909919 is a wasteful number, since it uses less digits than its factorization.

85909919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2962440.

The product of its (nonzero) digits is 262440, while the sum is 50.

The square root of 85909919 is about 9268.7603809787. The cubic root of 85909919 is about 441.2463269068.

The spelling of 85909919 in words is "eighty-five million, nine hundred nine thousand, nine hundred nineteen".