13515240161 has 4 divisors (see below), whose sum is σ = 13639233300. Its totient is φ = 13391247024.

The previous prime is 13515240133. The next prime is 13515240169. The reversal of 13515240161 is 16104251531.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7635264400 + 5879975761 = 87380^2 + 76681^2 .

It is a cyclic number.

It is not a de Polignac number, because 13515240161 - 2¹⁰ = 13515239137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13515240169) 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, 61996406 + ... + 61996623.

It is an arithmetic number, because the mean of its divisors is an integer number (3409808325).

Almost surely, 2^13515240161 is an apocalyptic number.

It is an amenable number.

13515240161 is a deficient number, since it is larger than the sum of its proper divisors (123993139).

13515240161 is a wasteful number, since it uses less digits than its factorization.

13515240161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123993138.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 13515240161 its reverse (16104251531), we get a palindrome (29619491692).

The spelling of 13515240161 in words is "thirteen billion, five hundred fifteen million, two hundred forty thousand, one hundred sixty-one".