1206541109 has 2 divisors, whose sum is σ = 1206541110. Its totient is φ = 1206541108.

The previous prime is 1206541057. The next prime is 1206541123. The reversal of 1206541109 is 9011456021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1007110225 + 199430884 = 31735^2 + 14122^2 .

It is a cyclic number.

It is not a de Polignac number, because 1206541109 - 2²⁸ = 938105653 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1206541139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603270554 + 603270555.

It is an arithmetic number, because the mean of its divisors is an integer number (603270555).

Almost surely, 2^1206541109 is an apocalyptic number.

It is an amenable number.

1206541109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206541109 is an equidigital number, since it uses as much as digits as its factorization.

1206541109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1206541109 is about 34735.3006176714. The cubic root of 1206541109 is about 1064.5858952688.

The spelling of 1206541109 in words is "one billion, two hundred six million, five hundred forty-one thousand, one hundred nine".