12927521 has 2 divisors, whose sum is σ = 12927522. Its totient is φ = 12927520.

The previous prime is 12927503. The next prime is 12927529. The reversal of 12927521 is 12572921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9541921 + 3385600 = 3089^2 + 1840^2 .

It is a cyclic number.

It is not a de Polignac number, because 12927521 - 2¹⁸ = 12665377 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (12927529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6463760 + 6463761.

It is an arithmetic number, because the mean of its divisors is an integer number (6463761).

Almost surely, 2^12927521 is an apocalyptic number.

It is an amenable number.

12927521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12927521 is an equidigital number, since it uses as much as digits as its factorization.

12927521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 12927521 is about 3595.4861979988. The cubic root of 12927521 is about 234.6956736680.

The spelling of 12927521 in words is "twelve million, nine hundred twenty-seven thousand, five hundred twenty-one".