12641861 has 2 divisors, whose sum is σ = 12641862. Its totient is φ = 12641860.

The previous prime is 12641851. The next prime is 12641869. The reversal of 12641861 is 16814621.

12641861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10764961 + 1876900 = 3281^2 + 1370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12641861 is a prime.

It is equal to p₈₂₇₃₉₀ and since 12641861 and 827390 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12641869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320930 + 6320931.

It is an arithmetic number, because the mean of its divisors is an integer number (6320931).

Almost surely, 2^12641861 is an apocalyptic number.

It is an amenable number.

12641861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12641861 is an equidigital number, since it uses as much as digits as its factorization.

12641861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 12641861 is about 3555.5394808664. The cubic root of 12641861 is about 232.9540884691.

It can be divided in two parts, 1264 and 1861, that added together give a 5-th power (3125 = 5⁵).

The spelling of 12641861 in words is "twelve million, six hundred forty-one thousand, eight hundred sixty-one".