91198871 has 6 divisors (see below), whose sum is σ = 91809216. Its totient is φ = 90590100.

The previous prime is 91198819. The next prime is 91198901. The reversal of 91198871 is 17889119.

It is a de Polignac number, because none of the positive numbers 2^k-91198871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91198171) 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 5 ways as a sum of consecutive naturals, for example, 131636 + ... + 132326.

It is an arithmetic number, because the mean of its divisors is an integer number (15301536).

Almost surely, 2^91198871 is an apocalyptic number.

91198871 is a deficient number, since it is larger than the sum of its proper divisors (610345).

91198871 is an frugal number, since it uses more digits than its factorization.

91198871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573 (or 882 counting only the distinct ones).

The product of its digits is 36288, while the sum is 44.

The square root of 91198871 is about 9549.8099981099. The cubic root of 91198871 is about 450.1215655106.

The spelling of 91198871 in words is "ninety-one million, one hundred ninety-eight thousand, eight hundred seventy-one".