9901614991 has 4 divisors (see below), whose sum is σ = 9903823272. Its totient is φ = 9899406712.

The previous prime is 9901614979. The next prime is 9901615001. The reversal of 9901614991 is 1994161099.

It is a happy number.

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 9901614991 - 2¹⁷ = 9901483919 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9901614911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097401 + ... + 1106386.

It is an arithmetic number, because the mean of its divisors is an integer number (2475955818).

Almost surely, 2^9901614991 is an apocalyptic number.

9901614991 is a deficient number, since it is larger than the sum of its proper divisors (2208281).

9901614991 is a wasteful number, since it uses less digits than its factorization.

9901614991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208280.

The product of its (nonzero) digits is 157464, while the sum is 49.

The square root of 9901614991 is about 99506.8590148438. The cubic root of 9901614991 is about 2147.3459221245.

The spelling of 9901614991 in words is "nine billion, nine hundred one million, six hundred fourteen thousand, nine hundred ninety-one".