991211200202 has 4 divisors (see below), whose sum is σ = 1486816800306. Its totient is φ = 495605600100.

The previous prime is 991211200193. The next prime is 991211200261. The reversal of 991211200202 is 202002112199.

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., 644409168001 + 346802032201 = 802751^2 + 588899^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247802800049 + ... + 247802800052.

Almost surely, 2^991211200202 is an apocalyptic number.

991211200202 is a deficient number, since it is larger than the sum of its proper divisors (495605600104).

991211200202 is a wasteful number, since it uses less digits than its factorization.

991211200202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495605600103.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 991211200202 in words is "nine hundred ninety-one billion, two hundred eleven million, two hundred thousand, two hundred two".