1181958159 has 4 divisors (see below), whose sum is σ = 1575944216. Its totient is φ = 787972104.

The previous prime is 1181958149. The next prime is 1181958161. The reversal of 1181958159 is 9518591811.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1181958159 - 2¹⁶ = 1181892623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181958119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196993024 + ... + 196993029.

It is an arithmetic number, because the mean of its divisors is an integer number (393986054).

Almost surely, 2^1181958159 is an apocalyptic number.

1181958159 is a deficient number, since it is larger than the sum of its proper divisors (393986057).

1181958159 is an equidigital number, since it uses as much as digits as its factorization.

1181958159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393986056.

The product of its digits is 129600, while the sum is 48.

The square root of 1181958159 is about 34379.6183661192. The cubic root of 1181958159 is about 1057.3060102781.

The spelling of 1181958159 in words is "one billion, one hundred eighty-one million, nine hundred fifty-eight thousand, one hundred fifty-nine".