86217131 has 16 divisors (see below), whose sum is σ = 115761408. Its totient is φ = 62013600.

The previous prime is 86217127. The next prime is 86217143. The reversal of 86217131 is 13171268.

It is not a de Polignac number, because 86217131 - 2² = 86217127 is a prime.

It is a super-2 number, since 2×86217131² = 14866787355742322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 86217094 and 86217103.

It is not an unprimeable number, because it can be changed into a prime (86217121) 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 15 ways as a sum of consecutive naturals, for example, 42065 + ... + 44066.

It is an arithmetic number, because the mean of its divisors is an integer number (7235088).

Almost surely, 2^86217131 is an apocalyptic number.

86217131 is a deficient number, since it is larger than the sum of its proper divisors (29544277).

86217131 is a wasteful number, since it uses less digits than its factorization.

86217131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86162.

The product of its digits is 2016, while the sum is 29.

The square root of 86217131 is about 9285.3180344025. The cubic root of 86217131 is about 441.7716636255.

Adding to 86217131 its reverse (13171268), we get a palindrome (99388399).

The spelling of 86217131 in words is "eighty-six million, two hundred seventeen thousand, one hundred thirty-one".