13503581281 has 8 divisors (see below), whose sum is σ = 14067396000. Its totient is φ = 12950931360.

The previous prime is 13503581279. The next prime is 13503581317. The reversal of 13503581281 is 18218530531.

It is a happy number.

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 13503581281 - 2¹ = 13503581279 is a prime.

It is a super-2 number, since 2×13503581281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13503581281.

It is not an unprimeable number, because it can be changed into a prime (13503588281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2788731 + ... + 2793568.

It is an arithmetic number, because the mean of its divisors is an integer number (1758424500).

Almost surely, 2^13503581281 is an apocalyptic number.

It is an amenable number.

13503581281 is a deficient number, since it is larger than the sum of its proper divisors (563814719).

13503581281 is an equidigital number, since it uses as much as digits as its factorization.

13503581281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582399.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 13503581281 in words is "thirteen billion, five hundred three million, five hundred eighty-one thousand, two hundred eighty-one".