12531985 has 4 divisors (see below), whose sum is σ = 15038388. Its totient is φ = 10025584.

The previous prime is 12531977. The next prime is 12532061. The reversal of 12531985 is 58913521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58913521 = 211 ⋅279211.

It can be written as a sum of positive squares in 2 ways, for example, as 7568001 + 4963984 = 2751^2 + 2228^2 .

It is a cyclic number.

It is not a de Polignac number, because 12531985 - 2³ = 12531977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12531985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1253194 + ... + 1253203.

It is an arithmetic number, because the mean of its divisors is an integer number (3759597).

Almost surely, 2^12531985 is an apocalyptic number.

It is an amenable number.

12531985 is a deficient number, since it is larger than the sum of its proper divisors (2506403).

12531985 is an equidigital number, since it uses as much as digits as its factorization.

12531985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506402.

The product of its digits is 10800, while the sum is 34.

The square root of 12531985 is about 3540.0543781134. The cubic root of 12531985 is about 232.2772213753.

The spelling of 12531985 in words is "twelve million, five hundred thirty-one thousand, nine hundred eighty-five".