9891121301 has 4 divisors (see below), whose sum is σ = 10132368204. Its totient is φ = 9649874400.

The previous prime is 9891121297. The next prime is 9891121307. The reversal of 9891121301 is 1031211989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1031211989 = 15889 ⋅64901.

It can be written as a sum of positive squares in 2 ways, for example, as 347785201 + 9543336100 = 18649^2 + 97690^2 .

It is a cyclic number.

It is not a de Polignac number, because 9891121301 - 2² = 9891121297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9891121307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120623390 + ... + 120623471.

It is an arithmetic number, because the mean of its divisors is an integer number (2533092051).

Almost surely, 2^9891121301 is an apocalyptic number.

It is an amenable number.

9891121301 is a deficient number, since it is larger than the sum of its proper divisors (241246903).

9891121301 is a wasteful number, since it uses less digits than its factorization.

9891121301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241246902.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 9891121301 is about 99454.1165613571. The cubic root of 9891121301 is about 2146.5870712545.

The spelling of 9891121301 in words is "nine billion, eight hundred ninety-one million, one hundred twenty-one thousand, three hundred one".