318121081 has 4 divisors (see below), whose sum is σ = 318692772. Its totient is φ = 317549392.

The previous prime is 318121061. The next prime is 318121117. The reversal of 318121081 is 180121813.

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 29800681 + 288320400 = 5459^2 + 16980^2 .

It is a cyclic number.

It is not a de Polignac number, because 318121081 - 2⁷ = 318120953 is a prime.

It is a super-2 number, since 2×318121081² = 202402044353217122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318121031) 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, 285010 + ... + 286123.

It is an arithmetic number, because the mean of its divisors is an integer number (79673193).

Almost surely, 2^318121081 is an apocalyptic number.

It is an amenable number.

318121081 is a deficient number, since it is larger than the sum of its proper divisors (571691).

318121081 is an equidigital number, since it uses as much as digits as its factorization.

318121081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571690.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 318121081 is about 17835.9491196852. The cubic root of 318121081 is about 682.6490389988.

Adding to 318121081 its reverse (180121813), we get a palindrome (498242894).

The spelling of 318121081 in words is "three hundred eighteen million, one hundred twenty-one thousand, eighty-one".