9975891 has 16 divisors (see below), whose sum is σ = 13708800. Its totient is φ = 6449568.

The previous prime is 9975863. The next prime is 9975899. The reversal of 9975891 is 1985799.

It is not a de Polignac number, because 9975891 - 2⁶ = 9975827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9975891.

It is not an unprimeable number, because it can be changed into a prime (9975899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19345 + ... + 19853.

It is an arithmetic number, because the mean of its divisors is an integer number (856800).

Almost surely, 2^9975891 is an apocalyptic number.

9975891 is a deficient number, since it is larger than the sum of its proper divisors (3732909).

9975891 is a wasteful number, since it uses less digits than its factorization.

9975891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698.

The product of its digits is 204120, while the sum is 48.

The square root of 9975891 is about 3158.4633922210. The cubic root of 9975891 is about 215.2701921243.

The spelling of 9975891 in words is "nine million, nine hundred seventy-five thousand, eight hundred ninety-one".