86549991 has 16 divisors (see below), whose sum is σ = 128027520. Its totient is φ = 51564320.

The previous prime is 86549971. The next prime is 86549999. The reversal of 86549991 is 19994568.

It is a cyclic number.

It is not a de Polignac number, because 86549991 - 2⁹ = 86549479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86549999) 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, 20280 + ... + 24173.

It is an arithmetic number, because the mean of its divisors is an integer number (8001720).

Almost surely, 2^86549991 is an apocalyptic number.

86549991 is a deficient number, since it is larger than the sum of its proper divisors (41477529).

86549991 is a wasteful number, since it uses less digits than its factorization.

86549991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44526.

The product of its digits is 699840, while the sum is 51.

The square root of 86549991 is about 9303.2247634893. The cubic root of 86549991 is about 442.3394521149.

The spelling of 86549991 in words is "eighty-six million, five hundred forty-nine thousand, nine hundred ninety-one".