318321493 has 8 divisors (see below), whose sum is σ = 371220800. Its totient is φ = 272846700.

The previous prime is 318321473. The next prime is 318321511. The reversal of 318321493 is 394123813.

It is not a de Polignac number, because 318321493 - 2¹⁷ = 318190421 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 (318321473) 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, 463683 + ... + 464368.

It is an arithmetic number, because the mean of its divisors is an integer number (46402600).

Almost surely, 2^318321493 is an apocalyptic number.

It is an amenable number.

318321493 is a deficient number, since it is larger than the sum of its proper divisors (52899307).

318321493 is an frugal number, since it uses more digits than its factorization.

318321493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928072 (or 928058 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 318321493 is about 17841.5664390770. The cubic root of 318321493 is about 682.7923621418.

The spelling of 318321493 in words is "three hundred eighteen million, three hundred twenty-one thousand, four hundred ninety-three".