1171111009 has 2 divisors, whose sum is σ = 1171111010. Its totient is φ = 1171111008.

The previous prime is 1171110989. The next prime is 1171111043. The reversal of 1171111009 is 9001111711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652547025 + 518563984 = 25545^2 + 22772^2 .

It is an emirp because it is prime and its reverse (9001111711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1171111009 - 2²⁵ = 1137556577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1171111099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585555504 + 585555505.

It is an arithmetic number, because the mean of its divisors is an integer number (585555505).

Almost surely, 2^1171111009 is an apocalyptic number.

It is an amenable number.

1171111009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171111009 is an equidigital number, since it uses as much as digits as its factorization.

1171111009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63, while the sum is 22.

The square root of 1171111009 is about 34221.4992219803. The cubic root of 1171111009 is about 1054.0616707215.

The spelling of 1171111009 in words is "one billion, one hundred seventy-one million, one hundred eleven thousand, nine".