91126891 has 4 divisors (see below), whose sum is σ = 91558984. Its totient is φ = 90694800.

The previous prime is 91126883. The next prime is 91126909. The reversal of 91126891 is 19862119.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91126891 - 2³ = 91126883 is a prime.

It is a super-2 number, since 2×91126891² = 16608220526651762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91126891.

It is not an unprimeable number, because it can be changed into a prime (91126801) 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 3 ways as a sum of consecutive naturals, for example, 215730 + ... + 216151.

It is an arithmetic number, because the mean of its divisors is an integer number (22889746).

Almost surely, 2^91126891 is an apocalyptic number.

91126891 is a deficient number, since it is larger than the sum of its proper divisors (432093).

91126891 is a wasteful number, since it uses less digits than its factorization.

91126891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432092.

The product of its digits is 7776, while the sum is 37.

The square root of 91126891 is about 9546.0405928322. The cubic root of 91126891 is about 450.0031127357.

The spelling of 91126891 in words is "ninety-one million, one hundred twenty-six thousand, eight hundred ninety-one".