318874981 has 8 divisors (see below), whose sum is σ = 330327000. Its totient is φ = 307453440.

The previous prime is 318874973. The next prime is 318875003. The reversal of 318874981 is 189478813.

It can be written as a sum of positive squares in 4 ways, for example, as 42185025 + 276689956 = 6495^2 + 16634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 318874981 - 2³ = 318874973 is a prime.

It is a super-2 number, since 2×318874981² = 203362507015500722, 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 (318874901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14845 + ... + 29293.

It is an arithmetic number, because the mean of its divisors is an integer number (41290875).

Almost surely, 2^318874981 is an apocalyptic number.

It is an amenable number.

318874981 is a deficient number, since it is larger than the sum of its proper divisors (11452019).

318874981 is a wasteful number, since it uses less digits than its factorization.

318874981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15239.

The product of its digits is 387072, while the sum is 49.

The square root of 318874981 is about 17857.0708964264. The cubic root of 318874981 is about 683.1878727198.

The spelling of 318874981 in words is "three hundred eighteen million, eight hundred seventy-four thousand, nine hundred eighty-one".