318923681 has 16 divisors (see below), whose sum is σ = 338669184. Its totient is φ = 299718144.

The previous prime is 318923659. The next prime is 318923687. The reversal of 318923681 is 186329813.

It is a cyclic number.

It is not a de Polignac number, because 318923681 - 2⁶ = 318923617 is a prime.

It is a super-2 number, since 2×318923681² = 203424628605179522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318923687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 363215 + ... + 364091.

It is an arithmetic number, because the mean of its divisors is an integer number (21166824).

Almost surely, 2^318923681 is an apocalyptic number.

It is an amenable number.

318923681 is a deficient number, since it is larger than the sum of its proper divisors (19745503).

318923681 is a wasteful number, since it uses less digits than its factorization.

318923681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160.

The product of its digits is 62208, while the sum is 41.

The square root of 318923681 is about 17858.4344498615. The cubic root of 318923681 is about 683.2226507757. Note that the first 3 decimals are identical.

The spelling of 318923681 in words is "three hundred eighteen million, nine hundred twenty-three thousand, six hundred eighty-one".