13011020181 has 6 divisors (see below), whose sum is σ = 18793695830. Its totient is φ = 8674013448.

The previous prime is 13011020179. The next prime is 13011020249. The reversal of 13011020181 is 18102011031.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8539423281 + 4471596900 = 92409^2 + 66870^2 .

It is not a de Polignac number, because 13011020181 - 2¹ = 13011020179 is a prime.

It is a super-2 number, since 2×13011020181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13011020161) 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, 722834446 + ... + 722834463.

Almost surely, 2^13011020181 is an apocalyptic number.

It is an amenable number.

13011020181 is a deficient number, since it is larger than the sum of its proper divisors (5782675649).

13011020181 is a wasteful number, since it uses less digits than its factorization.

13011020181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445668915 (or 1445668912 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The spelling of 13011020181 in words is "thirteen billion, eleven million, twenty thousand, one hundred eighty-one".