318921994 has 4 divisors (see below), whose sum is σ = 478382994. Its totient is φ = 159460996.

The previous prime is 318921983. The next prime is 318921997. The reversal of 318921994 is 499129813.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 265266369 + 53655625 = 16287^2 + 7325^2 .

It is a super-3 number, since 3×318921994³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (318921997) 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 as a sum of consecutive naturals, namely, 79730497 + ... + 79730500.

Almost surely, 2^318921994 is an apocalyptic number.

318921994 is a deficient number, since it is larger than the sum of its proper divisors (159461000).

318921994 is a wasteful number, since it uses less digits than its factorization.

318921994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159460999.

The product of its digits is 139968, while the sum is 46.

The square root of 318921994 is about 17858.3872172153. The cubic root of 318921994 is about 683.2214461002.

The spelling of 318921994 in words is "three hundred eighteen million, nine hundred twenty-one thousand, nine hundred ninety-four".