91159966 has 8 divisors (see below), whose sum is σ = 137186280. Its totient is φ = 45431208.

The previous prime is 91159961. The next prime is 91159969. The reversal of 91159966 is 66995119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×91159966² = 16620278802242312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91159961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73621 + ... + 74848.

It is an arithmetic number, because the mean of its divisors is an integer number (17148285).

Almost surely, 2^91159966 is an apocalyptic number.

91159966 is a deficient number, since it is larger than the sum of its proper divisors (46026314).

91159966 is a wasteful number, since it uses less digits than its factorization.

91159966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148778.

The product of its digits is 131220, while the sum is 46.

The square root of 91159966 is about 9547.7728293042. The cubic root of 91159966 is about 450.0575498414.

The spelling of 91159966 in words is "ninety-one million, one hundred fifty-nine thousand, nine hundred sixty-six".