86819231 has 2 divisors, whose sum is σ = 86819232. Its totient is φ = 86819230.

The previous prime is 86819219. The next prime is 86819281. The reversal of 86819231 is 13291868.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86819231 - 2¹⁴ = 86802847 is a prime.

It is a super-2 number, since 2×86819231² = 15075157742862722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86819281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43409615 + 43409616.

It is an arithmetic number, because the mean of its divisors is an integer number (43409616).

Almost surely, 2^86819231 is an apocalyptic number.

86819231 is a deficient number, since it is larger than the sum of its proper divisors (1).

86819231 is an equidigital number, since it uses as much as digits as its factorization.

86819231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 86819231 is about 9317.6837787081. The cubic root of 86819231 is about 442.7976543303.

The spelling of 86819231 in words is "eighty-six million, eight hundred nineteen thousand, two hundred thirty-one".