12561101 has 6 divisors (see below), whose sum is σ = 14611950. Its totient is φ = 10766616.

The previous prime is 12561091. The next prime is 12561103. The reversal of 12561101 is 10116521.

It can be written as a sum of positive squares in only one way, i.e., 11383876 + 1177225 = 3374^2 + 1085^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12561101 is a prime.

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 12561101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128126 + ... + 128223.

It is an arithmetic number, because the mean of its divisors is an integer number (2435325).

Almost surely, 2^12561101 is an apocalyptic number.

It is an amenable number.

12561101 is a deficient number, since it is larger than the sum of its proper divisors (2050849).

12561101 is an equidigital number, since it uses as much as digits as its factorization.

12561101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256363 (or 256356 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 12561101 is about 3544.1643584913. The cubic root of 12561101 is about 232.4569681797.

Adding to 12561101 its reverse (10116521), we get a palindrome (22677622).

The spelling of 12561101 in words is "twelve million, five hundred sixty-one thousand, one hundred one".