91166139 has 12 divisors (see below), whose sum is σ = 131767272. Its totient is φ = 60739200.

The previous prime is 91166093. The next prime is 91166197. The reversal of 91166139 is 93166119.

It is not a de Polignac number, because 91166139 - 2⁷ = 91166011 is a prime.

It is a super-2 number, since 2×91166139² = 16622529800334642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91116139) 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 11 ways as a sum of consecutive naturals, for example, 25704 + ... + 29034.

It is an arithmetic number, because the mean of its divisors is an integer number (10980606).

Almost surely, 2^91166139 is an apocalyptic number.

91166139 is a deficient number, since it is larger than the sum of its proper divisors (40601133).

91166139 is a wasteful number, since it uses less digits than its factorization.

91166139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6378 (or 6375 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 91166139 is about 9548.0960929392. The cubic root of 91166139 is about 450.0677083304.

The spelling of 91166139 in words is "ninety-one million, one hundred sixty-six thousand, one hundred thirty-nine".