85817813 has 4 divisors (see below), whose sum is σ = 90334560. Its totient is φ = 81301068.

The previous prime is 85817803. The next prime is 85817839. The reversal of 85817813 is 31871858.

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.

It is a cyclic number.

It is not a de Polignac number, because 85817813 - 2⁶ = 85817749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85817803) 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, 2258345 + ... + 2258382.

It is an arithmetic number, because the mean of its divisors is an integer number (22583640).

Almost surely, 2^85817813 is an apocalyptic number.

It is an amenable number.

85817813 is a deficient number, since it is larger than the sum of its proper divisors (4516747).

85817813 is a wasteful number, since it uses less digits than its factorization.

85817813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4516746.

The product of its digits is 53760, while the sum is 41.

The square root of 85817813 is about 9263.7904229316. The cubic root of 85817813 is about 441.0885804070.

The spelling of 85817813 in words is "eighty-five million, eight hundred seventeen thousand, eight hundred thirteen".