12861577 has 12 divisors (see below), whose sum is σ = 13796244. Its totient is φ = 11982080.

The previous prime is 12861557. The next prime is 12861581. The reversal of 12861577 is 77516821.

It can be written as a sum of positive squares in 2 ways, for example, as 3644281 + 9217296 = 1909^2 + 3036^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12861577 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 (12861517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21393 + ... + 21985.

It is an arithmetic number, because the mean of its divisors is an integer number (1149687).

Almost surely, 2^12861577 is an apocalyptic number.

It is an amenable number.

12861577 is a deficient number, since it is larger than the sum of its proper divisors (934667).

12861577 is an equidigital number, since it uses as much as digits as its factorization.

12861577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 657 counting only the distinct ones).

The product of its digits is 23520, while the sum is 37.

The square root of 12861577 is about 3586.3040863820. The cubic root of 12861577 is about 234.2959279810.

The spelling of 12861577 in words is "twelve million, eight hundred sixty-one thousand, five hundred seventy-seven".