86691799 has 2 divisors, whose sum is σ = 86691800. Its totient is φ = 86691798.

The previous prime is 86691791. The next prime is 86691809. The reversal of 86691799 is 99719668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86691799 - 2³ = 86691791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86691791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43345899 + 43345900.

It is an arithmetic number, because the mean of its divisors is an integer number (43345900).

Almost surely, 2^86691799 is an apocalyptic number.

86691799 is a deficient number, since it is larger than the sum of its proper divisors (1).

86691799 is an equidigital number, since it uses as much as digits as its factorization.

86691799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 55.

The square root of 86691799 is about 9310.8430874975. The cubic root of 86691799 is about 442.5809042703.

It can be divided in two parts, 866 and 91799, that added together give a triangular number (92665 = T₄₃₀).

The spelling of 86691799 in words is "eighty-six million, six hundred ninety-one thousand, seven hundred ninety-nine".