318261 has 4 divisors (see below), whose sum is σ = 424352. Its totient is φ = 212172.

The previous prime is 318259. The next prime is 318271. The reversal of 318261 is 162813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 318261 - 2¹ = 318259 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53041 + ... + 53046.

It is an arithmetic number, because the mean of its divisors is an integer number (106088).

2³¹⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

318261 is a deficient number, since it is larger than the sum of its proper divisors (106091).

318261 is a wasteful number, since it uses less digits than its factorization.

318261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106090.

The product of its digits is 288, while the sum is 21.

The square root of 318261 is about 564.1462576318. The cubic root of 318261 is about 68.2749107365.

The spelling of 318261 in words is "three hundred eighteen thousand, two hundred sixty-one".