13531121451 has 24 divisors (see below), whose sum is σ = 19652388080. Its totient is φ = 8971300800.

The previous prime is 13531121413. The next prime is 13531121503. The reversal of 13531121451 is 15412113531.

13531121451 is a `hidden beast` number, since 1 + 3 + 531 + 121 + 4 + 5 + 1 = 666.

It is not a de Polignac number, because 13531121451 - 2⁷ = 13531121323 is a prime.

It is a super-4 number, since 4×13531121451⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13531121251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1248765 + ... + 1259553.

Almost surely, 2^13531121451 is an apocalyptic number.

13531121451 is a deficient number, since it is larger than the sum of its proper divisors (6121266629).

13531121451 is a wasteful number, since it uses less digits than its factorization.

13531121451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11547 (or 11544 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

Adding to 13531121451 its reverse (15412113531), we get a palindrome (28943234982).

The spelling of 13531121451 in words is "thirteen billion, five hundred thirty-one million, one hundred twenty-one thousand, four hundred fifty-one".