1213361099 has 4 divisors (see below), whose sum is σ = 1213549920. Its totient is φ = 1213172280.

The previous prime is 1213361041. The next prime is 1213361129. The reversal of 1213361099 is 9901633121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213361099 - 2²⁰ = 1212312523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213361029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84419 + ... + 97740.

It is an arithmetic number, because the mean of its divisors is an integer number (303387480).

Almost surely, 2^1213361099 is an apocalyptic number.

1213361099 is a deficient number, since it is larger than the sum of its proper divisors (188821).

1213361099 is an equidigital number, since it uses as much as digits as its factorization.

1213361099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188820.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1213361099 is about 34833.3331594896. Note that the first 3 decimals coincide. The cubic root of 1213361099 is about 1066.5879897807.

The spelling of 1213361099 in words is "one billion, two hundred thirteen million, three hundred sixty-one thousand, ninety-nine".