13121155541 has 8 divisors (see below), whose sum is σ = 14133897624. Its totient is φ = 12108902400.

The previous prime is 13121155517. The next prime is 13121155547. The reversal of 13121155541 is 14555112131.

It is a happy number.

13121155541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 141110641 + 12980044900 = 11879^2 + 113930^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13121155541 - 2¹⁸ = 13120893397 is a prime.

It is a super-2 number, since 2×13121155541² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121155547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65516 + ... + 174741.

It is an arithmetic number, because the mean of its divisors is an integer number (1766737203).

Almost surely, 2^13121155541 is an apocalyptic number.

It is an amenable number.

13121155541 is a deficient number, since it is larger than the sum of its proper divisors (1012742083).

13121155541 is a wasteful number, since it uses less digits than its factorization.

13121155541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244471.

The product of its digits is 3000, while the sum is 29.

Adding to 13121155541 its reverse (14555112131), we get a palindrome (27676267672).

The spelling of 13121155541 in words is "thirteen billion, one hundred twenty-one million, one hundred fifty-five thousand, five hundred forty-one".