1211040409 has 2 divisors, whose sum is σ = 1211040410. Its totient is φ = 1211040408.

The previous prime is 1211040401. The next prime is 1211040443. The reversal of 1211040409 is 9040401121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207354009 + 3686400 = 34747^2 + 1920^2 .

It is an emirp because it is prime and its reverse (9040401121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211040409 - 2³ = 1211040401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211040409.

It is not a weakly prime, because it can be changed into another prime (1211040401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605520204 + 605520205.

It is an arithmetic number, because the mean of its divisors is an integer number (605520205).

Almost surely, 2^1211040409 is an apocalyptic number.

It is an amenable number.

1211040409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211040409 is an equidigital number, since it uses as much as digits as its factorization.

1211040409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1211040409 is about 34800.0058764363. The cubic root of 1211040409 is about 1065.9075658440.

The spelling of 1211040409 in words is "one billion, two hundred eleven million, forty thousand, four hundred nine".