1158713221 has 4 divisors (see below), whose sum is σ = 1164595212. Its totient is φ = 1152831232.

The previous prime is 1158713203. The next prime is 1158713243. The reversal of 1158713221 is 1223178511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 856440225 + 302272996 = 29265^2 + 17386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1158713221 - 2¹⁷ = 1158582149 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 (1158713291) 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, 2940700 + ... + 2941093.

It is an arithmetic number, because the mean of its divisors is an integer number (291148803).

Almost surely, 2^1158713221 is an apocalyptic number.

It is an amenable number.

1158713221 is a deficient number, since it is larger than the sum of its proper divisors (5881991).

1158713221 is an equidigital number, since it uses as much as digits as its factorization.

1158713221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5881990.

The product of its digits is 3360, while the sum is 31.

The square root of 1158713221 is about 34039.8769239843. The cubic root of 1158713221 is about 1050.3289131324.

The spelling of 1158713221 in words is "one billion, one hundred fifty-eight million, seven hundred thirteen thousand, two hundred twenty-one".