1181958149 has 2 divisors, whose sum is σ = 1181958150. Its totient is φ = 1181958148.

The previous prime is 1181958131. The next prime is 1181958161. The reversal of 1181958149 is 9418591811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1042127524 + 139830625 = 32282^2 + 11825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1181958149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1181958119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590979074 + 590979075.

It is an arithmetic number, because the mean of its divisors is an integer number (590979075).

Almost surely, 2^1181958149 is an apocalyptic number.

It is an amenable number.

1181958149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181958149 is an equidigital number, since it uses as much as digits as its factorization.

1181958149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 47.

The square root of 1181958149 is about 34379.6182206842. The cubic root of 1181958149 is about 1057.3060072963.

The spelling of 1181958149 in words is "one billion, one hundred eighty-one million, nine hundred fifty-eight thousand, one hundred forty-nine".