318553 has 4 divisors (see below), whose sum is σ = 320740. Its totient is φ = 316368.

The previous prime is 318523. The next prime is 318557. The reversal of 318553 is 355813.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 233289 + 85264 = 483^2 + 292^2 .

It is a 3-Lehmer number, since φ(318553) divides (318553-1)³.

It is a cyclic number.

It is not a de Polignac number, because 318553 - 2¹³ = 310361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (80185).

2³¹⁸⁵⁵³ is an apocalyptic number.

It is an amenable number.

318553 is a deficient number, since it is larger than the sum of its proper divisors (2187).

318553 is a wasteful number, since it uses less digits than its factorization.

318553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186.

The product of its digits is 1800, while the sum is 25.

The square root of 318553 is about 564.4049964343. The cubic root of 318553 is about 68.2957847780.

The spelling of 318553 in words is "three hundred eighteen thousand, five hundred fifty-three".