12640501 has 4 divisors (see below), whose sum is σ = 13190112. Its totient is φ = 12090892.

The previous prime is 12640499. The next prime is 12640513. The reversal of 12640501 is 10504621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10504621 = 2161 ⋅4861.

It is a cyclic number.

It is not a de Polignac number, because 12640501 - 2¹ = 12640499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274771 + ... + 274816.

It is an arithmetic number, because the mean of its divisors is an integer number (3297528).

Almost surely, 2^12640501 is an apocalyptic number.

It is an amenable number.

12640501 is a deficient number, since it is larger than the sum of its proper divisors (549611).

12640501 is an equidigital number, since it uses as much as digits as its factorization.

12640501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549610.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 12640501 is about 3555.3482248579. The cubic root of 12640501 is about 232.9457345060.

The spelling of 12640501 in words is "twelve million, six hundred forty thousand, five hundred one".