12318531 has 8 divisors (see below), whose sum is σ = 16650000. Its totient is φ = 8099712.

The previous prime is 12318529. The next prime is 12318539. The reversal of 12318531 is 13581321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12318531 - 2¹ = 12318529 is a prime.

It is a super-2 number, since 2×12318531² = 303492411995922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12318539) 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, 27906 + ... + 28343.

It is an arithmetic number, because the mean of its divisors is an integer number (2081250).

Almost surely, 2^12318531 is an apocalyptic number.

12318531 is a deficient number, since it is larger than the sum of its proper divisors (4331469).

12318531 is an equidigital number, since it uses as much as digits as its factorization.

12318531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56325.

The product of its digits is 720, while the sum is 24.

The square root of 12318531 is about 3509.7764886101. The cubic root of 12318531 is about 230.9508900305.

Adding to 12318531 its reverse (13581321), we get a palindrome (25899852).

The spelling of 12318531 in words is "twelve million, three hundred eighteen thousand, five hundred thirty-one".