318664381 has 4 divisors (see below), whose sum is σ = 364187872. Its totient is φ = 273140892.

The previous prime is 318664351. The next prime is 318664399. The reversal of 318664381 is 183466813.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183466813 = 59 ⋅3109607.

It is a cyclic number.

It is not a de Polignac number, because 318664381 - 2⁵ = 318664349 is a prime.

It is a super-2 number, since 2×318664381² = 203093975436226322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318664331) 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, 22761735 + ... + 22761748.

It is an arithmetic number, because the mean of its divisors is an integer number (91046968).

Almost surely, 2^318664381 is an apocalyptic number.

It is an amenable number.

318664381 is a deficient number, since it is larger than the sum of its proper divisors (45523491).

318664381 is an equidigital number, since it uses as much as digits as its factorization.

318664381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45523490.

The product of its digits is 82944, while the sum is 40.

The square root of 318664381 is about 17851.1730987070. The cubic root of 318664381 is about 683.0374364871.

The spelling of 318664381 in words is "three hundred eighteen million, six hundred sixty-four thousand, three hundred eighty-one".