9991106 has 4 divisors (see below), whose sum is σ = 14986662. Its totient is φ = 4995552.

The previous prime is 9991067. The next prime is 9991123. The reversal of 9991106 is 6011999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6027025 + 3964081 = 2455^2 + 1991^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2497775 + ... + 2497778.

Almost surely, 2^9991106 is an apocalyptic number.

9991106 is a deficient number, since it is larger than the sum of its proper divisors (4995556).

9991106 is a wasteful number, since it uses less digits than its factorization.

9991106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4995555.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 9991106 is about 3160.8710824708. The cubic root of 9991106 is about 215.3795782509.

The spelling of 9991106 in words is "nine million, nine hundred ninety-one thousand, one hundred six".