13601761281 has 12 divisors (see below), whose sum is σ = 19916126308. Its totient is φ = 8943623424.

The previous prime is 13601761259. The next prime is 13601761289. The reversal of 13601761281 is 18216710631.

13601761281 is a `hidden beast` number, since 1 + 36 + 0 + 1 + 7 + 612 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3817386225 + 9784375056 = 61785^2 + 98916^2 .

It is not a de Polignac number, because 13601761281 - 2¹⁷ = 13601630209 is a prime.

It is a super-2 number, since 2×13601761281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13601761289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10350760 + ... + 10352073.

Almost surely, 2^13601761281 is an apocalyptic number.

It is an amenable number.

13601761281 is a deficient number, since it is larger than the sum of its proper divisors (6314365027).

13601761281 is a wasteful number, since it uses less digits than its factorization.

13601761281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20702912 (or 20702909 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 13601761281 in words is "thirteen billion, six hundred one million, seven hundred sixty-one thousand, two hundred eighty-one".