86517731 has 2 divisors, whose sum is σ = 86517732. Its totient is φ = 86517730.

The previous prime is 86517727. The next prime is 86517733. The reversal of 86517731 is 13771568.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86517731 - 2² = 86517727 is a prime.

It is a super-2 number, since 2×86517731² = 14970635554776722, which contains 22 as substring.

Together with 86517733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86517733) 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, 43258865 + 43258866.

It is an arithmetic number, because the mean of its divisors is an integer number (43258866).

Almost surely, 2^86517731 is an apocalyptic number.

86517731 is a deficient number, since it is larger than the sum of its proper divisors (1).

86517731 is an equidigital number, since it uses as much as digits as its factorization.

86517731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 38.

The square root of 86517731 is about 9301.4907944910. The cubic root of 86517731 is about 442.2844871793.

The spelling of 86517731 in words is "eighty-six million, five hundred seventeen thousand, seven hundred thirty-one".