1209990211 has 2 divisors, whose sum is σ = 1209990212. Its totient is φ = 1209990210.

The previous prime is 1209990193. The next prime is 1209990253. The reversal of 1209990211 is 1120999021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1209990211 - 2¹³ = 1209982019 is a prime.

It is not a weakly prime, because it can be changed into another prime (1209990911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604995105 + 604995106.

It is an arithmetic number, because the mean of its divisors is an integer number (604995106).

Almost surely, 2^1209990211 is an apocalyptic number.

1209990211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209990211 is an equidigital number, since it uses as much as digits as its factorization.

1209990211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 1209990211 is about 34784.9135545857. The cubic root of 1209990211 is about 1065.5993631555.

The spelling of 1209990211 in words is "one billion, two hundred nine million, nine hundred ninety thousand, two hundred eleven".