12905513 has 4 divisors (see below), whose sum is σ = 12912900. Its totient is φ = 12898128.

The previous prime is 12905479. The next prime is 12905521. The reversal of 12905513 is 31550921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4214809 + 8690704 = 2053^2 + 2948^2 .

It is a cyclic number.

It is not a de Polignac number, because 12905513 - 2⁸ = 12905257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12905573) 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, 563 + ... + 5111.

It is an arithmetic number, because the mean of its divisors is an integer number (3228225).

Almost surely, 2^12905513 is an apocalyptic number.

It is an amenable number.

12905513 is a deficient number, since it is larger than the sum of its proper divisors (7387).

12905513 is an equidigital number, since it uses as much as digits as its factorization.

12905513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7386.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 12905513 is about 3592.4243902969. The cubic root of 12905513 is about 234.5624149080.

The spelling of 12905513 in words is "twelve million, nine hundred five thousand, five hundred thirteen".