86823817 has 2 divisors, whose sum is σ = 86823818. Its totient is φ = 86823816.

The previous prime is 86823809. The next prime is 86823823. The reversal of 86823817 is 71832868.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80084601 + 6739216 = 8949^2 + 2596^2 .

It is a cyclic number.

It is not a de Polignac number, because 86823817 - 2³ = 86823809 is a prime.

It is a super-4 number, since 4×86823817⁴ (a number of 33 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (86823017) 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 as a sum of consecutive naturals, namely, 43411908 + 43411909.

It is an arithmetic number, because the mean of its divisors is an integer number (43411909).

Almost surely, 2^86823817 is an apocalyptic number.

It is an amenable number.

86823817 is a deficient number, since it is larger than the sum of its proper divisors (1).

86823817 is an equidigital number, since it uses as much as digits as its factorization.

86823817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 86823817 is about 9317.9298666603. The cubic root of 86823817 is about 442.8054507377.

The spelling of 86823817 in words is "eighty-six million, eight hundred twenty-three thousand, eight hundred seventeen".