9991040101 has 4 divisors (see below), whose sum is σ = 11418331552. Its totient is φ = 8563748652.

The previous prime is 9991040077. The next prime is 9991040113. The reversal of 9991040101 is 1010401999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9991040101 - 2⁵ = 9991040069 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 (9991070101) 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, 713645715 + ... + 713645728.

It is an arithmetic number, because the mean of its divisors is an integer number (2854582888).

Almost surely, 2^9991040101 is an apocalyptic number.

It is an amenable number.

9991040101 is a deficient number, since it is larger than the sum of its proper divisors (1427291451).

9991040101 is a wasteful number, since it uses less digits than its factorization.

9991040101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427291450.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 9991040101 is about 99955.1904655281. The cubic root of 9991040101 is about 2153.7910471869.

The spelling of 9991040101 in words is "nine billion, nine hundred ninety-one million, forty thousand, one hundred one".