991211202012112 has 10 divisors (see below), whose sum is σ = 1920471703898498. Its totient is φ = 495605601006048.

The previous prime is 991211202012089. The next prime is 991211202012131. The reversal of 991211202012112 is 211210202112199.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 979456891468176 + 11754310543936 = 31296276^2 + 3428456^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30975350062863 + ... + 30975350062894.

Almost surely, 2^{991211202012112} is an apocalyptic number.

It is an amenable number.

991211202012112 is a deficient number, since it is larger than the sum of its proper divisors (929260501886386).

991211202012112 is a wasteful number, since it uses less digits than its factorization.

991211202012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61950700125765 (or 61950700125759 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 991211202012112 in words is "nine hundred ninety-one trillion, two hundred eleven billion, two hundred two million, twelve thousand, one hundred twelve".