991001120212 has 12 divisors (see below), whose sum is σ = 1735653951220. Its totient is φ = 495099991296.

The previous prime is 991001120177. The next prime is 991001120227. The reversal of 991001120212 is 212021100199.

991001120212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 449001845776 + 541999274436 = 670076^2 + 736206^2 .

It is a super-2 number, since 2×991001120212² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100136637 + ... + 100146532.

Almost surely, 2^991001120212 is an apocalyptic number.

It is an amenable number.

991001120212 is a deficient number, since it is larger than the sum of its proper divisors (744652831008).

991001120212 is a wasteful number, since it uses less digits than its factorization.

991001120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200284410 (or 200284408 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 991001120212 in words is "nine hundred ninety-one billion, one million, one hundred twenty thousand, two hundred twelve".