13181081501 has 4 divisors (see below), whose sum is σ = 15064093152. Its totient is φ = 11298069852.

The previous prime is 13181081491. The next prime is 13181081509. The reversal of 13181081501 is 10518018131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10518018131 = 89 ⋅118179979.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13181081501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13181081509) 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, 941505815 + ... + 941505828.

It is an arithmetic number, because the mean of its divisors is an integer number (3766023288).

Almost surely, 2^13181081501 is an apocalyptic number.

It is an amenable number.

13181081501 is a deficient number, since it is larger than the sum of its proper divisors (1883011651).

13181081501 is an equidigital number, since it uses as much as digits as its factorization.

13181081501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883011650.

The product of its (nonzero) digits is 960, while the sum is 29.

Adding to 13181081501 its reverse (10518018131), we get a palindrome (23699099632).

The spelling of 13181081501 in words is "thirteen billion, one hundred eighty-one million, eighty-one thousand, five hundred one".