991111070 has 16 divisors (see below), whose sum is σ = 1784801088. Its totient is φ = 396266400.

The previous prime is 991111049. The next prime is 991111111. The reversal of 991111070 is 70111199.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2432 + ... + 44588.

It is an arithmetic number, because the mean of its divisors is an integer number (111550068).

Almost surely, 2^991111070 is an apocalyptic number.

991111070 is a deficient number, since it is larger than the sum of its proper divisors (793690018).

991111070 is a wasteful number, since it uses less digits than its factorization.

991111070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44515.

The product of its (nonzero) digits is 567, while the sum is 29.

The square root of 991111070 is about 31481.9165553814. The cubic root of 991111070 is about 997.0282004896.

The spelling of 991111070 in words is "nine hundred ninety-one million, one hundred eleven thousand, seventy".