91166140 has 96 divisors (see below), whose sum is σ = 217183680. Its totient is φ = 31911936.

The previous prime is 91166093. The next prime is 91166197. The reversal of 91166140 is 4166119.

It is a super-2 number, since 2×91166140² = 16622530164999200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91166099 and 91166108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 806724 + ... + 806836.

It is an arithmetic number, because the mean of its divisors is an integer number (2262330).

Almost surely, 2^91166140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91166140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108591840).

91166140 is an abundant number, since it is smaller than the sum of its proper divisors (126017540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91166140 is a wasteful number, since it uses less digits than its factorization.

91166140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 91166140 is about 9548.0961453056. The cubic root of 91166140 is about 450.0677099760.

The spelling of 91166140 in words is "ninety-one million, one hundred sixty-six thousand, one hundred forty".