318491216 has 10 divisors (see below), whose sum is σ = 617076762. Its totient is φ = 159245600.

The previous prime is 318491203. The next prime is 318491219. The reversal of 318491216 is 612194813.

It can be written as a sum of positive squares in only one way, i.e., 163737616 + 154753600 = 12796^2 + 12440^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318491219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9952835 + ... + 9952866.

Almost surely, 2^318491216 is an apocalyptic number.

It is an amenable number.

318491216 is a deficient number, since it is larger than the sum of its proper divisors (298585546).

318491216 is a wasteful number, since it uses less digits than its factorization.

318491216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19905709 (or 19905703 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 318491216 is about 17846.3221981449. The cubic root of 318491216 is about 682.9136912390.

The spelling of 318491216 in words is "three hundred eighteen million, four hundred ninety-one thousand, two hundred sixteen".