1158543779 has 4 divisors (see below), whose sum is σ = 1158620184. Its totient is φ = 1158467376.

The previous prime is 1158543773. The next prime is 1158543809. The reversal of 1158543779 is 9773458511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1158543779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1158543773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6917 + ... + 48630.

It is an arithmetic number, because the mean of its divisors is an integer number (289655046).

Almost surely, 2^1158543779 is an apocalyptic number.

1158543779 is a deficient number, since it is larger than the sum of its proper divisors (76405).

1158543779 is an equidigital number, since it uses as much as digits as its factorization.

1158543779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76404.

The product of its digits is 1058400, while the sum is 50.

The square root of 1158543779 is about 34037.3879579500. The cubic root of 1158543779 is about 1050.2777130873.

The spelling of 1158543779 in words is "one billion, one hundred fifty-eight million, five hundred forty-three thousand, seven hundred seventy-nine".