12861641 has 8 divisors (see below), whose sum is σ = 13899144. Its totient is φ = 11831040.

The previous prime is 12861637. The next prime is 12861701. The reversal of 12861641 is 14616821.

It can be written as a sum of positive squares in 4 ways, for example, as 2493241 + 10368400 = 1579^2 + 3220^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12861641 - 2² = 12861637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12861631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2561 + ... + 5681.

It is an arithmetic number, because the mean of its divisors is an integer number (1737393).

Almost surely, 2^12861641 is an apocalyptic number.

It is an amenable number.

12861641 is a deficient number, since it is larger than the sum of its proper divisors (1037503).

12861641 is a wasteful number, since it uses less digits than its factorization.

12861641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3451.

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

The square root of 12861641 is about 3586.3130092060. The cubic root of 12861641 is about 234.2963166040.

The spelling of 12861641 in words is "twelve million, eight hundred sixty-one thousand, six hundred forty-one".