12859561 has 16 divisors (see below), whose sum is σ = 15906240. Its totient is φ = 10221120.

The previous prime is 12859547. The next prime is 12859577. The reversal of 12859561 is 16595821.

It is not a de Polignac number, because 12859561 - 2⁷ = 12859433 is a prime.

It is a super-2 number, since 2×12859561² = 330736618225442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12859561.

It is not an unprimeable number, because it can be changed into a prime (12859661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351 + ... + 5083.

It is an arithmetic number, because the mean of its divisors is an integer number (994140).

Almost surely, 2^12859561 is an apocalyptic number.

12859561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12859561 is a deficient number, since it is larger than the sum of its proper divisors (3046679).

12859561 is a wasteful number, since it uses less digits than its factorization.

12859561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4776.

The product of its digits is 21600, while the sum is 37.

The square root of 12859561 is about 3586.0230060612. The cubic root of 12859561 is about 234.2836856960.

The spelling of 12859561 in words is "twelve million, eight hundred fifty-nine thousand, five hundred sixty-one".