1211100198 has 128 divisors (see below), whose sum is σ = 3101552640. Its totient is φ = 306184320.

The previous prime is 1211100173. The next prime is 1211100211. The reversal of 1211100198 is 8910011121.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4279365 + ... + 4279647.

It is an arithmetic number, because the mean of its divisors is an integer number (24230880).

Almost surely, 2^1211100198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211100198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1550776320).

1211100198 is an abundant number, since it is smaller than the sum of its proper divisors (1890452442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211100198 is a wasteful number, since it uses less digits than its factorization.

1211100198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522.

The product of its (nonzero) digits is 144, while the sum is 24.

The square root of 1211100198 is about 34800.8649030452. The cubic root of 1211100198 is about 1065.9251068218.

The spelling of 1211100198 in words is "one billion, two hundred eleven million, one hundred thousand, one hundred ninety-eight".