85813609 has 4 divisors (see below), whose sum is σ = 98072704. Its totient is φ = 73554516.

The previous prime is 85813601. The next prime is 85813613. The reversal of 85813609 is 90631858.

It is a happy number.

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: 90631858 = 2 ⋅45315929.

It is not a de Polignac number, because 85813609 - 2³ = 85813601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85813601) 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, 6129537 + ... + 6129550.

It is an arithmetic number, because the mean of its divisors is an integer number (24518176).

Almost surely, 2^85813609 is an apocalyptic number.

It is an amenable number.

85813609 is a deficient number, since it is larger than the sum of its proper divisors (12259095).

85813609 is a wasteful number, since it uses less digits than its factorization.

85813609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12259094.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 85813609 is about 9263.5635151922. The cubic root of 85813609 is about 441.0813776806.

The spelling of 85813609 in words is "eighty-five million, eight hundred thirteen thousand, six hundred nine".