318763321 has 4 divisors (see below), whose sum is σ = 319558644. Its totient is φ = 317968000.

The previous prime is 318763307. The next prime is 318763337. The reversal of 318763321 is 123367813.

318763321 = T₄₆₀ + T₄₆₁ + ... + T₁₂₆₁.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123367813 = 1409 ⋅87557.

It can be written as a sum of positive squares in 2 ways, for example, as 160909225 + 157854096 = 12685^2 + 12564^2 .

It is a cyclic number.

It is not a de Polignac number, because 318763321 - 2¹¹ = 318761273 is a prime.

It is a super-2 number, since 2×318763321² = 203220109629898082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318763301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397060 + ... + 397861.

It is an arithmetic number, because the mean of its divisors is an integer number (79889661).

Almost surely, 2^318763321 is an apocalyptic number.

It is an amenable number.

318763321 is a deficient number, since it is larger than the sum of its proper divisors (795323).

318763321 is an equidigital number, since it uses as much as digits as its factorization.

318763321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795322.

The product of its digits is 18144, while the sum is 34.

The square root of 318763321 is about 17853.9441300795. The cubic root of 318763321 is about 683.1081197671.

The spelling of 318763321 in words is "three hundred eighteen million, seven hundred sixty-three thousand, three hundred twenty-one".