12122561 has 8 divisors (see below), whose sum is σ = 13250304. Its totient is φ = 10999120.

The previous prime is 12122557. The next prime is 12122563. The reversal of 12122561 is 16522121.

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

It is not a de Polignac number, because 12122561 - 2² = 12122557 is a prime.

It is a super-3 number, since 3×12122561³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12122563) 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 7 ways as a sum of consecutive naturals, for example, 8855 + ... + 10131.

It is an arithmetic number, because the mean of its divisors is an integer number (1656288).

Almost surely, 2^12122561 is an apocalyptic number.

12122561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12122561 is a deficient number, since it is larger than the sum of its proper divisors (1127743).

12122561 is a wasteful number, since it uses less digits than its factorization.

12122561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151.

The product of its digits is 240, while the sum is 20.

The square root of 12122561 is about 3481.7468316924. The cubic root of 12122561 is about 229.7196394874.

Adding to 12122561 its reverse (16522121), we get a palindrome (28644682).

It can be divided in two parts, 1212 and 2561, that added together give a palindrome (3773).

The spelling of 12122561 in words is "twelve million, one hundred twenty-two thousand, five hundred sixty-one".