12001312261 has 2 divisors, whose sum is σ = 12001312262. Its totient is φ = 12001312260.

The previous prime is 12001312159. The next prime is 12001312273. The reversal of 12001312261 is 16221310021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10099044036 + 1902268225 = 100494^2 + 43615^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001312261 - 2¹¹ = 12001310213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12001312291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000656130 + 6000656131.

It is an arithmetic number, because the mean of its divisors is an integer number (6000656131).

Almost surely, 2^12001312261 is an apocalyptic number.

It is an amenable number.

12001312261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001312261 is an equidigital number, since it uses as much as digits as its factorization.

12001312261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 12001312261 its reverse (16221310021), we get a palindrome (28222622282).

The spelling of 12001312261 in words is "twelve billion, one million, three hundred twelve thousand, two hundred sixty-one".