86031817 has 4 divisors (see below), whose sum is σ = 88130196. Its totient is φ = 83933440.

The previous prime is 86031809. The next prime is 86031823. The reversal of 86031817 is 71813068.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23242041 + 62789776 = 4821^2 + 7924^2 .

It is a cyclic number.

It is not a de Polignac number, because 86031817 - 2³ = 86031809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86031857) 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, 1049128 + ... + 1049209.

It is an arithmetic number, because the mean of its divisors is an integer number (22032549).

Almost surely, 2^86031817 is an apocalyptic number.

It is an amenable number.

86031817 is a deficient number, since it is larger than the sum of its proper divisors (2098379).

86031817 is a wasteful number, since it uses less digits than its factorization.

86031817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2098378.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 86031817 is about 9275.3337945327. Note that the first 3 decimals coincide. The cubic root of 86031817 is about 441.4549237946.

The spelling of 86031817 in words is "eighty-six million, thirty-one thousand, eight hundred seventeen".