13531555121 has 16 divisors (see below), whose sum is σ = 16001884800. Its totient is φ = 11195737728.

The previous prime is 13531555097. The next prime is 13531555129. The reversal of 13531555121 is 12155513531.

It is not a de Polignac number, because 13531555121 - 2⁶ = 13531555057 is a prime.

It is a super-2 number, since 2×13531555121² (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 (13531555129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1371221 + ... + 1381053.

It is an arithmetic number, because the mean of its divisors is an integer number (1000117800).

Almost surely, 2^13531555121 is an apocalyptic number.

It is an amenable number.

13531555121 is a deficient number, since it is larger than the sum of its proper divisors (2470329679).

13531555121 is an equidigital number, since it uses as much as digits as its factorization.

13531555121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16648.

The product of its digits is 11250, while the sum is 32.

The spelling of 13531555121 in words is "thirteen billion, five hundred thirty-one million, five hundred fifty-five thousand, one hundred twenty-one".