318506131 has 4 divisors (see below), whose sum is σ = 323904600. Its totient is φ = 313107664.

The previous prime is 318506119. The next prime is 318506137. The reversal of 318506131 is 131605813.

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

It is a cyclic number.

It is not a de Polignac number, because 318506131 - 2⁵ = 318506099 is a prime.

It is a super-2 number, since 2×318506131² = 202892310969178322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 318506131.

It is not an unprimeable number, because it can be changed into a prime (318506137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2699146 + ... + 2699263.

It is an arithmetic number, because the mean of its divisors is an integer number (80976150).

Almost surely, 2^318506131 is an apocalyptic number.

318506131 is a deficient number, since it is larger than the sum of its proper divisors (5398469).

318506131 is an equidigital number, since it uses as much as digits as its factorization.

318506131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5398468.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 318506131 is about 17846.7400664659. The cubic root of 318506131 is about 682.9243513956.

The spelling of 318506131 in words is "three hundred eighteen million, five hundred six thousand, one hundred thirty-one".