12531566 has 4 divisors (see below), whose sum is σ = 18797352. Its totient is φ = 6265782.

The previous prime is 12531553. The next prime is 12531569. The reversal of 12531566 is 66513521.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3132890 + ... + 3132893.

It is an arithmetic number, because the mean of its divisors is an integer number (4699338).

Almost surely, 2^12531566 is an apocalyptic number.

12531566 is a deficient number, since it is larger than the sum of its proper divisors (6265786).

12531566 is an equidigital number, since it uses as much as digits as its factorization.

12531566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6265785.

The product of its digits is 5400, while the sum is 29.

The square root of 12531566 is about 3539.9951977369. The cubic root of 12531566 is about 232.2746326596.

The spelling of 12531566 in words is "twelve million, five hundred thirty-one thousand, five hundred sixty-six".