12509501 has 4 divisors (see below), whose sum is σ = 13245372. Its totient is φ = 11773632.

The previous prime is 12509479. The next prime is 12509507. The reversal of 12509501 is 10590521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10590521 = 2837 ⋅3733.

It can be written as a sum of positive squares in 2 ways, for example, as 5359225 + 7150276 = 2315^2 + 2674^2 .

It is a cyclic number.

It is not a de Polignac number, because 12509501 - 2⁶ = 12509437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12509507) 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, 367910 + ... + 367943.

It is an arithmetic number, because the mean of its divisors is an integer number (3311343).

Almost surely, 2^12509501 is an apocalyptic number.

It is an amenable number.

12509501 is a deficient number, since it is larger than the sum of its proper divisors (735871).

12509501 is an equidigital number, since it uses as much as digits as its factorization.

12509501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735870.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 12509501 is about 3536.8772950160. The cubic root of 12509501 is about 232.1382264368.

The spelling of 12509501 in words is "twelve million, five hundred nine thousand, five hundred one".