86051991 has 4 divisors (see below), whose sum is σ = 114735992. Its totient is φ = 57367992.

The previous prime is 86051983. The next prime is 86052013. The reversal of 86051991 is 19915068.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 86051991 - 2³ = 86051983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86051921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14341996 + ... + 14342001.

It is an arithmetic number, because the mean of its divisors is an integer number (28683998).

Almost surely, 2^86051991 is an apocalyptic number.

86051991 is a deficient number, since it is larger than the sum of its proper divisors (28684001).

86051991 is a wasteful number, since it uses less digits than its factorization.

86051991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28684000.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 86051991 is about 9276.4212388183. The cubic root of 86051991 is about 441.4894273690.

The spelling of 86051991 in words is "eighty-six million, fifty-one thousand, nine hundred ninety-one".