12503581 has 4 divisors (see below), whose sum is σ = 12535164. Its totient is φ = 12472000.

The previous prime is 12503573. The next prime is 12503609. The reversal of 12503581 is 18530521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18530521 = 2143 ⋅8647.

It can be written as a sum of positive squares in 2 ways, for example, as 6579225 + 5924356 = 2565^2 + 2434^2 .

It is a cyclic number.

It is not a de Polignac number, because 12503581 - 2³ = 12503573 is a prime.

It is a super-2 number, since 2×12503581² = 312679075647122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12500581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15190 + ... + 15991.

It is an arithmetic number, because the mean of its divisors is an integer number (3133791).

Almost surely, 2^12503581 is an apocalyptic number.

It is an amenable number.

12503581 is a deficient number, since it is larger than the sum of its proper divisors (31583).

12503581 is an equidigital number, since it uses as much as digits as its factorization.

12503581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31582.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 12503581 is about 3536.0402995441. The cubic root of 12503581 is about 232.1016016041.

The spelling of 12503581 in words is "twelve million, five hundred three thousand, five hundred eighty-one".