86805591 has 16 divisors (see below), whose sum is σ = 117600000. Its totient is φ = 56947968.

The previous prime is 86805571. The next prime is 86805599. The reversal of 86805591 is 19550868.

It is not a de Polignac number, because 86805591 - 2⁹ = 86805079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86805599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57160 + ... + 58658.

It is an arithmetic number, because the mean of its divisors is an integer number (7350000).

Almost surely, 2^86805591 is an apocalyptic number.

86805591 is a deficient number, since it is larger than the sum of its proper divisors (30794409).

86805591 is a wasteful number, since it uses less digits than its factorization.

86805591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798.

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 86805591 is about 9316.9518083974. The cubic root of 86805591 is about 442.7744640906.

The spelling of 86805591 in words is "eighty-six million, eight hundred five thousand, five hundred ninety-one".