12782531 has 4 divisors (see below), whose sum is σ = 12789912. Its totient is φ = 12775152.

The previous prime is 12782513. The next prime is 12782599. The reversal of 12782531 is 13528721.

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.

It is a cyclic number.

It is not a de Polignac number, because 12782531 - 2⁶ = 12782467 is a prime.

It is a super-2 number, since 2×12782531² = 326786197531922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12782494 and 12782503.

It is not an unprimeable number, because it can be changed into a prime (12782431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476 + ... + 5078.

It is an arithmetic number, because the mean of its divisors is an integer number (3197478).

Almost surely, 2^12782531 is an apocalyptic number.

12782531 is a deficient number, since it is larger than the sum of its proper divisors (7381).

12782531 is an equidigital number, since it uses as much as digits as its factorization.

12782531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7380.

The product of its digits is 3360, while the sum is 29.

The square root of 12782531 is about 3575.2665634887. The cubic root of 12782531 is about 233.8149546388.

The spelling of 12782531 in words is "twelve million, seven hundred eighty-two thousand, five hundred thirty-one".