118781321 has 8 divisors (see below), whose sum is σ = 121451400. Its totient is φ = 116127232.

The previous prime is 118781287. The next prime is 118781339. The reversal of 118781321 is 123187811.

It can be written as a sum of positive squares in 4 ways, for example, as 26832400 + 91948921 = 5180^2 + 9589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 118781321 - 2¹⁰ = 118780297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118783321) 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 7 ways as a sum of consecutive naturals, for example, 11705 + ... + 19353.

It is an arithmetic number, because the mean of its divisors is an integer number (15181425).

Almost surely, 2^118781321 is an apocalyptic number.

It is an amenable number.

118781321 is a deficient number, since it is larger than the sum of its proper divisors (2670079).

118781321 is an equidigital number, since it uses as much as digits as its factorization.

118781321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7995.

The product of its digits is 2688, while the sum is 32.

The square root of 118781321 is about 10898.6843701430. The cubic root of 118781321 is about 491.5669965284.

The spelling of 118781321 in words is "one hundred eighteen million, seven hundred eighty-one thousand, three hundred twenty-one".