13151535521 has 4 divisors (see below), whose sum is σ = 13232219952. Its totient is φ = 13070851092.

The previous prime is 13151535517. The next prime is 13151535541. The reversal of 13151535521 is 12553515131.

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.

It is a cyclic number.

It is not a de Polignac number, because 13151535521 - 2² = 13151535517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13151535541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40341971 + ... + 40342296.

It is an arithmetic number, because the mean of its divisors is an integer number (3308054988).

Almost surely, 2^13151535521 is an apocalyptic number.

It is an amenable number.

13151535521 is a deficient number, since it is larger than the sum of its proper divisors (80684431).

13151535521 is an equidigital number, since it uses as much as digits as its factorization.

13151535521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80684430.

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

The spelling of 13151535521 in words is "thirteen billion, one hundred fifty-one million, five hundred thirty-five thousand, five hundred twenty-one".