91986771 has 24 divisors (see below), whose sum is σ = 130509264. Its totient is φ = 57620160.

The previous prime is 91986767. The next prime is 91986787. The reversal of 91986771 is 17768919.

It is a happy number.

It is not a de Polignac number, because 91986771 - 2² = 91986767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91986771.

It is not an unprimeable number, because it can be changed into a prime (91986701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169761 + ... + 170301.

It is an arithmetic number, because the mean of its divisors is an integer number (5437886).

Almost surely, 2^91986771 is an apocalyptic number.

91986771 is a deficient number, since it is larger than the sum of its proper divisors (38522493).

91986771 is a wasteful number, since it uses less digits than its factorization.

91986771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739 (or 720 counting only the distinct ones).

The product of its digits is 190512, while the sum is 48.

The square root of 91986771 is about 9590.9734125374. The cubic root of 91986771 is about 451.4141046716.

The spelling of 91986771 in words is "ninety-one million, nine hundred eighty-six thousand, seven hundred seventy-one".