9901623591 has 24 divisors (see below), whose sum is σ = 14404406016. Its totient is φ = 6554059920.

The previous prime is 9901623587. The next prime is 9901623601. The reversal of 9901623591 is 1953261099.

It is a happy number.

9901623591 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9901623591 - 2² = 9901623587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9901621591) 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 23 ways as a sum of consecutive naturals, for example, 1803136 + ... + 1808618.

It is an arithmetic number, because the mean of its divisors is an integer number (600183584).

Almost surely, 2^9901623591 is an apocalyptic number.

9901623591 is a deficient number, since it is larger than the sum of its proper divisors (4502782425).

9901623591 is a wasteful number, since it uses less digits than its factorization.

9901623591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6883 (or 6880 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 9901623591 is about 99506.9022279359. The cubic root of 9901623591 is about 2147.3465438133.

The spelling of 9901623591 in words is "nine billion, nine hundred one million, six hundred twenty-three thousand, five hundred ninety-one".