1318531 has 4 divisors (see below), whose sum is σ = 1320832. Its totient is φ = 1316232.

The previous prime is 1318517. The next prime is 1318549. The reversal of 1318531 is 1358131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1358131 = 277 ⋅4903.

It is a cyclic number.

It is not a de Polignac number, because 1318531 - 2⁹ = 1318019 is a prime.

It is a super-2 number, since 2×1318531² = 3477047995922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318831) 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, 481 + ... + 1693.

It is an arithmetic number, because the mean of its divisors is an integer number (330208).

2^1318531 is an apocalyptic number.

1318531 is a deficient number, since it is larger than the sum of its proper divisors (2301).

1318531 is a wasteful number, since it uses less digits than its factorization.

1318531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300.

The product of its digits is 360, while the sum is 22.

The square root of 1318531 is about 1148.2730511512. The cubic root of 1318531 is about 109.6554231115.

It can be divided in two parts, 1318 and 531, that added together give a square (1849 = 43²).

The spelling of 1318531 in words is "one million, three hundred eighteen thousand, five hundred thirty-one".