1181299109 has 2 divisors, whose sum is σ = 1181299110. Its totient is φ = 1181299108.

The previous prime is 1181299061. The next prime is 1181299117. The reversal of 1181299109 is 9019921811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1181296900 + 2209 = 34370^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181299109 - 2¹² = 1181295013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1181299129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590649554 + 590649555.

It is an arithmetic number, because the mean of its divisors is an integer number (590649555).

Almost surely, 2^1181299109 is an apocalyptic number.

It is an amenable number.

1181299109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181299109 is an equidigital number, since it uses as much as digits as its factorization.

1181299109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 41.

The square root of 1181299109 is about 34370.0321355683. The cubic root of 1181299109 is about 1057.1094587408.

The spelling of 1181299109 in words is "one billion, one hundred eighty-one million, two hundred ninety-nine thousand, one hundred nine".