12861599 has 2 divisors, whose sum is σ = 12861600. Its totient is φ = 12861598.

The previous prime is 12861581. The next prime is 12861631. The reversal of 12861599 is 99516821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12861599 - 2¹² = 12857503 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12860599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6430799 + 6430800.

It is an arithmetic number, because the mean of its divisors is an integer number (6430800).

Almost surely, 2^12861599 is an apocalyptic number.

12861599 is a deficient number, since it is larger than the sum of its proper divisors (1).

12861599 is an equidigital number, since it uses as much as digits as its factorization.

12861599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 12861599 is about 3586.3071536052. The cubic root of 12861599 is about 234.2960615703.

The spelling of 12861599 in words is "twelve million, eight hundred sixty-one thousand, five hundred ninety-nine".