13531201261 has 2 divisors, whose sum is σ = 13531201262. Its totient is φ = 13531201260.

The previous prime is 13531201247. The next prime is 13531201331. The reversal of 13531201261 is 16210213531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12071197161 + 1460004100 = 109869^2 + 38210^2 .

It is an emirp because it is prime and its reverse (16210213531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13531201261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13531241261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765600630 + 6765600631.

It is an arithmetic number, because the mean of its divisors is an integer number (6765600631).

Almost surely, 2^13531201261 is an apocalyptic number.

It is an amenable number.

13531201261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531201261 is an equidigital number, since it uses as much as digits as its factorization.

13531201261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 13531201261 its reverse (16210213531), we get a palindrome (29741414792).

The spelling of 13531201261 in words is "thirteen billion, five hundred thirty-one million, two hundred one thousand, two hundred sixty-one".