1211312099 has 2 divisors, whose sum is σ = 1211312100. Its totient is φ = 1211312098.

The previous prime is 1211312083. The next prime is 1211312131. The reversal of 1211312099 is 9902131121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211312099 - 2⁴ = 1211312083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211312009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605656049 + 605656050.

It is an arithmetic number, because the mean of its divisors is an integer number (605656050).

Almost surely, 2^1211312099 is an apocalyptic number.

1211312099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211312099 is an equidigital number, since it uses as much as digits as its factorization.

1211312099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 1211312099 is about 34803.9092488186. The cubic root of 1211312099 is about 1065.9872699758.

The spelling of 1211312099 in words is "one billion, two hundred eleven million, three hundred twelve thousand, ninety-nine".