991202230211 has 8 divisors (see below), whose sum is σ = 992171608560. Its totient is φ = 990233297568.

The previous prime is 991202230121. The next prime is 991202230217. The reversal of 991202230211 is 112032202199.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991202230211 is a prime.

It is a super-2 number, since 2×991202230211² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991202230217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4428485 + ... + 4646921.

It is an arithmetic number, because the mean of its divisors is an integer number (124021451070).

Almost surely, 2^991202230211 is an apocalyptic number.

991202230211 is a deficient number, since it is larger than the sum of its proper divisors (969378349).

991202230211 is a wasteful number, since it uses less digits than its factorization.

991202230211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222853.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 991202230211 in words is "nine hundred ninety-one billion, two hundred two million, two hundred thirty thousand, two hundred eleven".