9991475 has 24 divisors (see below), whose sum is σ = 13561632. Its totient is φ = 7257600.

The previous prime is 9991469. The next prime is 9991489. The reversal of 9991475 is 5741999.

9991475 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-9991475 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22859 + ... + 23291.

It is an arithmetic number, because the mean of its divisors is an integer number (565068).

Almost surely, 2^9991475 is an apocalyptic number.

9991475 is a deficient number, since it is larger than the sum of its proper divisors (3570157).

9991475 is a wasteful number, since it uses less digits than its factorization.

9991475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527 (or 522 counting only the distinct ones).

The product of its digits is 102060, while the sum is 44.

The square root of 9991475 is about 3160.9294519176. The cubic root of 9991475 is about 215.3822297453.

The spelling of 9991475 in words is "nine million, nine hundred ninety-one thousand, four hundred seventy-five".