12639577 has 2 divisors, whose sum is σ = 12639578. Its totient is φ = 12639576.

The previous prime is 12639559. The next prime is 12639637. The reversal of 12639577 is 77593621.

12639577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8128201 + 4511376 = 2851^2 + 2124^2 .

It is a cyclic number.

It is not a de Polignac number, because 12639577 - 2¹¹ = 12637529 is a prime.

It is not a weakly prime, because it can be changed into another prime (12639527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319788 + 6319789.

It is an arithmetic number, because the mean of its divisors is an integer number (6319789).

Almost surely, 2^12639577 is an apocalyptic number.

It is an amenable number.

12639577 is a deficient number, since it is larger than the sum of its proper divisors (1).

12639577 is an equidigital number, since it uses as much as digits as its factorization.

12639577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 40.

The square root of 12639577 is about 3555.2182774058. The cubic root of 12639577 is about 232.9400583833.

The spelling of 12639577 in words is "twelve million, six hundred thirty-nine thousand, five hundred seventy-seven".