12509081 has 4 divisors (see below), whose sum is σ = 13471332. Its totient is φ = 11546832.

The previous prime is 12509009. The next prime is 12509083. The reversal of 12509081 is 18090521.

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 2 ways, for example, as 3297856 + 9211225 = 1816^2 + 3035^2 .

It is a cyclic number.

It is not a de Polignac number, because 12509081 - 2¹⁰ = 12508057 is a prime.

It is a super-2 number, since 2×12509081² = 312954214929122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12509081.

It is not an unprimeable number, because it can be changed into a prime (12509083) 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 in 3 ways as a sum of consecutive naturals, for example, 481106 + ... + 481131.

It is an arithmetic number, because the mean of its divisors is an integer number (3367833).

Almost surely, 2^12509081 is an apocalyptic number.

It is an amenable number.

12509081 is a deficient number, since it is larger than the sum of its proper divisors (962251).

12509081 is an equidigital number, since it uses as much as digits as its factorization.

12509081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962250.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 12509081 is about 3536.8179201084. The cubic root of 12509081 is about 232.1356284342.

The spelling of 12509081 in words is "twelve million, five hundred nine thousand, eighty-one".