1131201109 has 2 divisors, whose sum is σ = 1131201110. Its totient is φ = 1131201108.

The previous prime is 1131201103. The next prime is 1131201121. The reversal of 1131201109 is 9011021311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 704902500 + 426298609 = 26550^2 + 20647^2 .

It is an emirp because it is prime and its reverse (9011021311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131201109 - 2¹³ = 1131192917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131201103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565600554 + 565600555.

It is an arithmetic number, because the mean of its divisors is an integer number (565600555).

Almost surely, 2^1131201109 is an apocalyptic number.

It is an amenable number.

1131201109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131201109 is an equidigital number, since it uses as much as digits as its factorization.

1131201109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 1131201109 is about 33633.3333019491. Note that the first 4 decimals coincide. The cubic root of 1131201109 is about 1041.9493484097.

The spelling of 1131201109 in words is "one billion, one hundred thirty-one million, two hundred one thousand, one hundred nine".