86806861 has 2 divisors, whose sum is σ = 86806862. Its totient is φ = 86806860.

The previous prime is 86806823. The next prime is 86806883. The reversal of 86806861 is 16860868.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86769225 + 37636 = 9315^2 + 194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86806861 is a prime.

It is a super-2 number, since 2×86806861² = 15070862233346642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86806891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43403430 + 43403431.

It is an arithmetic number, because the mean of its divisors is an integer number (43403431).

Almost surely, 2^86806861 is an apocalyptic number.

It is an amenable number.

86806861 is a deficient number, since it is larger than the sum of its proper divisors (1).

86806861 is an equidigital number, since it uses as much as digits as its factorization.

86806861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 86806861 is about 9317.0199634862. The cubic root of 86806861 is about 442.7766234017.

The spelling of 86806861 in words is "eighty-six million, eight hundred six thousand, eight hundred sixty-one".