318672991 has 12 divisors (see below), whose sum is σ = 394369392. Its totient is φ = 252135936.

The previous prime is 318672989. The next prime is 318673001. The reversal of 318672991 is 199276813.

It is a happy number.

It is not a de Polignac number, because 318672991 - 2¹ = 318672989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318672911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133506 + ... + 135871.

It is an arithmetic number, because the mean of its divisors is an integer number (32864116).

Almost surely, 2^318672991 is an apocalyptic number.

318672991 is a deficient number, since it is larger than the sum of its proper divisors (75696401).

318672991 is a wasteful number, since it uses less digits than its factorization.

318672991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269410 (or 269397 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The square root of 318672991 is about 17851.4142576996. The cubic root of 318672991 is about 683.0435880996.

The spelling of 318672991 in words is "three hundred eighteen million, six hundred seventy-two thousand, nine hundred ninety-one".