1181213899 has 2 divisors, whose sum is σ = 1181213900. Its totient is φ = 1181213898.

The previous prime is 1181213867. The next prime is 1181213903. The reversal of 1181213899 is 9983121811.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1181213899 - 2⁵ = 1181213867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1181213849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590606949 + 590606950.

It is an arithmetic number, because the mean of its divisors is an integer number (590606950).

Almost surely, 2^1181213899 is an apocalyptic number.

1181213899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181213899 is an equidigital number, since it uses as much as digits as its factorization.

1181213899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 43.

The square root of 1181213899 is about 34368.7925158857. The cubic root of 1181213899 is about 1057.0840408310.

The spelling of 1181213899 in words is "one billion, one hundred eighty-one million, two hundred thirteen thousand, eight hundred ninety-nine".