86543939 has 2 divisors, whose sum is σ = 86543940. Its totient is φ = 86543938.

The previous prime is 86543921. The next prime is 86543969. The reversal of 86543939 is 93934568.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86543939 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 86543893 and 86543902.

It is not a weakly prime, because it can be changed into another prime (86543969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43271969 + 43271970.

It is an arithmetic number, because the mean of its divisors is an integer number (43271970).

Almost surely, 2^86543939 is an apocalyptic number.

86543939 is a deficient number, since it is larger than the sum of its proper divisors (1).

86543939 is an equidigital number, since it uses as much as digits as its factorization.

86543939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 47.

The square root of 86543939 is about 9302.8994942437. The cubic root of 86543939 is about 442.3291416930.

The spelling of 86543939 in words is "eighty-six million, five hundred forty-three thousand, nine hundred thirty-nine".