12861617 has 4 divisors (see below), whose sum is σ = 12873840. Its totient is φ = 12849396.

The previous prime is 12861599. The next prime is 12861631. The reversal of 12861617 is 71616821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71616821 = 163 ⋅439367.

It is a cyclic number.

It is not a de Polignac number, because 12861617 - 2⁶ = 12861553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12861637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4367 + ... + 6692.

It is an arithmetic number, because the mean of its divisors is an integer number (3218460).

Almost surely, 2^12861617 is an apocalyptic number.

It is an amenable number.

12861617 is a deficient number, since it is larger than the sum of its proper divisors (12223).

12861617 is a wasteful number, since it uses less digits than its factorization.

12861617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12222.

The product of its digits is 4032, while the sum is 32.

The square root of 12861617 is about 3586.3096631496. The cubic root of 12861617 is about 234.2961708705.

The spelling of 12861617 in words is "twelve million, eight hundred sixty-one thousand, six hundred seventeen".