12645531 has 8 divisors (see below), whose sum is σ = 18734160. Its totient is φ = 8430336.

The previous prime is 12645509. The next prime is 12645533. The reversal of 12645531 is 13554621.

12645531 is a `hidden beast` number, since 12 + 645 + 5 + 3 + 1 = 666.

12645531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12645531 - 2⁵ = 12645499 is a prime.

It is a super-2 number, since 2×12645531² = 319818908543922, 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: 468353 = 12645531 / (1 + 2 + 6 + 4 + 5 + 5 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 12645495 and 12645504.

It is not an unprimeable number, because it can be changed into a prime (12645533) 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, 234150 + ... + 234203.

It is an arithmetic number, because the mean of its divisors is an integer number (2341770).

Almost surely, 2^12645531 is an apocalyptic number.

12645531 is a deficient number, since it is larger than the sum of its proper divisors (6088629).

12645531 is an equidigital number, since it uses as much as digits as its factorization.

12645531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468362 (or 468356 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 12645531 is about 3556.0555394988. The cubic root of 12645531 is about 232.9766288948.

The spelling of 12645531 in words is "twelve million, six hundred forty-five thousand, five hundred thirty-one".