86691863 has 2 divisors, whose sum is σ = 86691864. Its totient is φ = 86691862.

The previous prime is 86691811. The next prime is 86691883. The reversal of 86691863 is 36819668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86691863 - 2⁶ = 86691799 is a prime.

It is a super-2 number, since 2×86691863² = 15030958220821538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86691883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43345931 + 43345932.

It is an arithmetic number, because the mean of its divisors is an integer number (43345932).

Almost surely, 2^86691863 is an apocalyptic number.

86691863 is a deficient number, since it is larger than the sum of its proper divisors (1).

86691863 is an equidigital number, since it uses as much as digits as its factorization.

86691863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 86691863 is about 9310.8465243500. The cubic root of 86691863 is about 442.5810131817.

It can be divided in two parts, 866 and 91863, that added together give a palindrome (92729).

The spelling of 86691863 in words is "eighty-six million, six hundred ninety-one thousand, eight hundred sixty-three".