12671557 has 2 divisors, whose sum is σ = 12671558. Its totient is φ = 12671556.

The previous prime is 12671543. The next prime is 12671563. The reversal of 12671557 is 75517621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12173121 + 498436 = 3489^2 + 706^2 .

It is a cyclic number.

It is not a de Polignac number, because 12671557 - 2¹¹ = 12669509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12671587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6335778 + 6335779.

It is an arithmetic number, because the mean of its divisors is an integer number (6335779).

Almost surely, 2^12671557 is an apocalyptic number.

It is an amenable number.

12671557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12671557 is an equidigital number, since it uses as much as digits as its factorization.

12671557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14700, while the sum is 34.

The square root of 12671557 is about 3559.7130502331. The cubic root of 12671557 is about 233.1363505316.

The spelling of 12671557 in words is "twelve million, six hundred seventy-one thousand, five hundred fifty-seven".