12861099 has 20 divisors (see below), whose sum is σ = 19453896. Its totient is φ = 8466336.

The previous prime is 12861097. The next prime is 12861103. The reversal of 12861099 is 99016821.

It is not a de Polignac number, because 12861099 - 2¹ = 12861097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12861091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5767 + ... + 7679.

Almost surely, 2^12861099 is an apocalyptic number.

12861099 is a deficient number, since it is larger than the sum of its proper divisors (6592797).

12861099 is an equidigital number, since it uses as much as digits as its factorization.

12861099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008 (or 1999 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 12861099 is about 3586.2374433381. The cubic root of 12861099 is about 234.2930254121.

The spelling of 12861099 in words is "twelve million, eight hundred sixty-one thousand, ninety-nine".