118221557 has 4 divisors (see below), whose sum is σ = 118495020. Its totient is φ = 117948096.

The previous prime is 118221539. The next prime is 118221581. The reversal of 118221557 is 755122811.

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 46158436 + 72063121 = 6794^2 + 8489^2 .

It is a cyclic number.

It is not a de Polignac number, because 118221557 - 2¹² = 118217461 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 (118221457) 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 in 3 ways as a sum of consecutive naturals, for example, 136082 + ... + 136947.

It is an arithmetic number, because the mean of its divisors is an integer number (29623755).

Almost surely, 2^118221557 is an apocalyptic number.

It is an amenable number.

118221557 is a deficient number, since it is larger than the sum of its proper divisors (273463).

118221557 is an equidigital number, since it uses as much as digits as its factorization.

118221557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273462.

The product of its digits is 5600, while the sum is 32.

The square root of 118221557 is about 10872.9736962801. The cubic root of 118221557 is about 490.7936008480.

The spelling of 118221557 in words is "one hundred eighteen million, two hundred twenty-one thousand, five hundred fifty-seven".