12531866 has 4 divisors (see below), whose sum is σ = 18797802. Its totient is φ = 6265932.

The previous prime is 12531859. The next prime is 12531889. The reversal of 12531866 is 66813521.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 6651241 + 5880625 = 2579^2 + 2425^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3132965 + ... + 3132968.

Almost surely, 2^12531866 is an apocalyptic number.

12531866 is a deficient number, since it is larger than the sum of its proper divisors (6265936).

12531866 is an equidigital number, since it uses as much as digits as its factorization.

12531866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6265935.

The product of its digits is 8640, while the sum is 32.

The square root of 12531866 is about 3540.0375704221. The cubic root of 12531866 is about 232.2764861612.

The spelling of 12531866 in words is "twelve million, five hundred thirty-one thousand, eight hundred sixty-six".