91841021101 has 4 divisors (see below), whose sum is σ = 91867933692. Its totient is φ = 91814108512.

The previous prime is 91841021099. The next prime is 91841021177. The reversal of 91841021101 is 10112014819.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36545968900 + 55295052201 = 191170^2 + 235149^2 .

It is a cyclic number.

It is not a de Polignac number, because 91841021101 - 2¹ = 91841021099 is a prime.

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 91841021101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91841021191) 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, 13451176 + ... + 13458001.

It is an arithmetic number, because the mean of its divisors is an integer number (22966983423).

Almost surely, 2^91841021101 is an apocalyptic number.

It is an amenable number.

91841021101 is a deficient number, since it is larger than the sum of its proper divisors (26912591).

91841021101 is a wasteful number, since it uses less digits than its factorization.

91841021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26912590.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 91841021101 in words is "ninety-one billion, eight hundred forty-one million, twenty-one thousand, one hundred one".