86191605 has 24 divisors (see below), whose sum is σ = 151084440. Its totient is φ = 45450240.

The previous prime is 86191559. The next prime is 86191661. The reversal of 86191605 is 50619168.

It can be written as a sum of positive squares in 4 ways, for example, as 2304324 + 83887281 = 1518^2 + 9159^2 .

It is not a de Polignac number, because 86191605 - 2¹³ = 86183413 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 86191605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6756 + ... + 14765.

It is an arithmetic number, because the mean of its divisors is an integer number (6295185).

Almost surely, 2^86191605 is an apocalyptic number.

It is an amenable number.

86191605 is a deficient number, since it is larger than the sum of its proper divisors (64892835).

86191605 is a wasteful number, since it uses less digits than its factorization.

86191605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21621 (or 21618 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 86191605 is about 9283.9433970700. The cubic root of 86191605 is about 441.7280613993.

The spelling of 86191605 in words is "eighty-six million, one hundred ninety-one thousand, six hundred five".