12618531 has 8 divisors (see below), whose sum is σ = 18694160. Its totient is φ = 8412336.

The previous prime is 12618511. The next prime is 12618547. The reversal of 12618531 is 13581621.

12618531 is a `hidden beast` number, since 12 + 618 + 5 + 31 = 666.

It is not a de Polignac number, because 12618531 - 2¹⁴ = 12602147 is a prime.

It is a super-2 number, since 2×12618531² = 318454649195922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 467353 = 12618531 / (1 + 2 + 6 + 1 + 8 + 5 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12618495 and 12618504.

It is not an unprimeable number, because it can be changed into a prime (12618511) 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, 233650 + ... + 233703.

It is an arithmetic number, because the mean of its divisors is an integer number (2336770).

Almost surely, 2^12618531 is an apocalyptic number.

12618531 is a deficient number, since it is larger than the sum of its proper divisors (6075629).

12618531 is an equidigital number, since it uses as much as digits as its factorization.

12618531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467362 (or 467356 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 12618531 is about 3552.2571697443. The cubic root of 12618531 is about 232.8106980417.

The spelling of 12618531 in words is "twelve million, six hundred eighteen thousand, five hundred thirty-one".