13581481631 has 4 divisors (see below), whose sum is σ = 13753399200. Its totient is φ = 13409564064.

The previous prime is 13581481559. The next prime is 13581481633. The reversal of 13581481631 is 13618418531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13581481631 is a prime.

It is a super-2 number, since 2×13581481631² (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 (13581481633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85958666 + ... + 85958823.

It is an arithmetic number, because the mean of its divisors is an integer number (3438349800).

Almost surely, 2^13581481631 is an apocalyptic number.

13581481631 is a deficient number, since it is larger than the sum of its proper divisors (171917569).

13581481631 is an equidigital number, since it uses as much as digits as its factorization.

13581481631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171917568.

The product of its digits is 69120, while the sum is 41.

The spelling of 13581481631 in words is "thirteen billion, five hundred eighty-one million, four hundred eighty-one thousand, six hundred thirty-one".