9477991 has 4 divisors (see below), whose sum is σ = 9492552. Its totient is φ = 9463432.

The previous prime is 9477989. The next prime is 9478009. The reversal of 9477991 is 1997749.

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 9477991 - 2¹ = 9477989 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 (9477911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6256 + ... + 7621.

It is an arithmetic number, because the mean of its divisors is an integer number (2373138).

Almost surely, 2^9477991 is an apocalyptic number.

9477991 is a deficient number, since it is larger than the sum of its proper divisors (14561).

9477991 is a wasteful number, since it uses less digits than its factorization.

9477991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14560.

The product of its digits is 142884, while the sum is 46.

The square root of 9477991 is about 3078.6345999485. The cubic root of 9477991 is about 211.6274979362.

The spelling of 9477991 in words is "nine million, four hundred seventy-seven thousand, nine hundred ninety-one".