86278631 has 2 divisors, whose sum is σ = 86278632. Its totient is φ = 86278630.

The previous prime is 86278607. The next prime is 86278649. The reversal of 86278631 is 13687268.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86278631 - 2¹⁸ = 86016487 is a prime.

It is a super-2 number, since 2×86278631² = 14888004334468322, 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 (86278651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43139315 + 43139316.

It is an arithmetic number, because the mean of its divisors is an integer number (43139316).

Almost surely, 2^86278631 is an apocalyptic number.

86278631 is a deficient number, since it is larger than the sum of its proper divisors (1).

86278631 is an equidigital number, since it uses as much as digits as its factorization.

86278631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 86278631 is about 9288.6291238266. The cubic root of 86278631 is about 441.8766794908.

The spelling of 86278631 in words is "eighty-six million, two hundred seventy-eight thousand, six hundred thirty-one".