86278191 has 16 divisors (see below), whose sum is σ = 119654400. Its totient is φ = 55250208.

The previous prime is 86278151. The next prime is 86278193. The reversal of 86278191 is 19187268.

86278191 = 1509² + 1510² + ... + 1545².

It is not a de Polignac number, because 86278191 - 2⁹ = 86277679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86278193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3850 + ... + 13688.

It is an arithmetic number, because the mean of its divisors is an integer number (7478400).

Almost surely, 2^86278191 is an apocalyptic number.

86278191 is a deficient number, since it is larger than the sum of its proper divisors (33376209).

86278191 is a wasteful number, since it uses less digits than its factorization.

86278191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9958.

The product of its digits is 48384, while the sum is 42.

The square root of 86278191 is about 9288.6054389235. The cubic root of 86278191 is about 441.8759283351.

The spelling of 86278191 in words is "eighty-six million, two hundred seventy-eight thousand, one hundred ninety-one".