9955791 has 20 divisors (see below), whose sum is σ = 15657400. Its totient is φ = 6286896.

The previous prime is 9955783. The next prime is 9955819. The reversal of 9955791 is 1975599.

9955791 is a `hidden beast` number, since 9 + 9 + 557 + 91 = 666.

It is not a de Polignac number, because 9955791 - 2³ = 9955783 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 (9955291) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1696 + ... + 4773.

It is an arithmetic number, because the mean of its divisors is an integer number (782870).

Almost surely, 2^9955791 is an apocalyptic number.

9955791 is a deficient number, since it is larger than the sum of its proper divisors (5701609).

9955791 is a wasteful number, since it uses less digits than its factorization.

9955791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6500 (or 6491 counting only the distinct ones).

The product of its digits is 127575, while the sum is 45.

The square root of 9955791 is about 3155.2798608047. The cubic root of 9955791 is about 215.1255153173.

It can be divided in two parts, 995 and 5791, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 9955791 in words is "nine million, nine hundred fifty-five thousand, seven hundred ninety-one".