86157917 has 4 divisors (see below), whose sum is σ = 86176860. Its totient is φ = 86138976.

The previous prime is 86157893. The next prime is 86157919. The reversal of 86157917 is 71975168.

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 9174841 + 76983076 = 3029^2 + 8774^2 .

It is a cyclic number.

It is not a de Polignac number, because 86157917 - 2⁸ = 86157661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86157919) 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, 1913 + ... + 13265.

It is an arithmetic number, because the mean of its divisors is an integer number (21544215).

Almost surely, 2^86157917 is an apocalyptic number.

It is an amenable number.

86157917 is a deficient number, since it is larger than the sum of its proper divisors (18943).

86157917 is a wasteful number, since it uses less digits than its factorization.

86157917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18942.

The product of its digits is 105840, while the sum is 44.

The square root of 86157917 is about 9282.1289045132. The cubic root of 86157917 is about 441.6705040765.

The spelling of 86157917 in words is "eighty-six million, one hundred fifty-seven thousand, nine hundred seventeen".