9901591671 has 8 divisors (see below), whose sum is σ = 13350461040. Its totient is φ = 6526891712.

The previous prime is 9901591669. The next prime is 9901591681. The reversal of 9901591671 is 1761951099.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9901591671 - 2¹ = 9901591669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9901591671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9901591681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18542040 + ... + 18542573.

It is an arithmetic number, because the mean of its divisors is an integer number (1668807630).

Almost surely, 2^9901591671 is an apocalyptic number.

9901591671 is a deficient number, since it is larger than the sum of its proper divisors (3448869369).

9901591671 is a wasteful number, since it uses less digits than its factorization.

9901591671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37084705.

The product of its (nonzero) digits is 153090, while the sum is 48.

The square root of 9901591671 is about 99506.7418369228. The cubic root of 9901591671 is about 2147.3442363340.

The spelling of 9901591671 in words is "nine billion, nine hundred one million, five hundred ninety-one thousand, six hundred seventy-one".