1171220009 has 2 divisors, whose sum is σ = 1171220010. Its totient is φ = 1171220008.

The previous prime is 1171220003. The next prime is 1171220081. The reversal of 1171220009 is 9000221711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1090848784 + 80371225 = 33028^2 + 8965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1171220009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1171220003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585610004 + 585610005.

It is an arithmetic number, because the mean of its divisors is an integer number (585610005).

Almost surely, 2^1171220009 is an apocalyptic number.

It is an amenable number.

1171220009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171220009 is an equidigital number, since it uses as much as digits as its factorization.

1171220009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 1171220009 is about 34223.0917510385. The cubic root of 1171220009 is about 1054.0943716232.

The spelling of 1171220009 in words is "one billion, one hundred seventy-one million, two hundred twenty thousand, nine".