13515231215 has 8 divisors (see below), whose sum is σ = 16308883440. Its totient is φ = 10751780992.

The previous prime is 13515231209. The next prime is 13515231269. The reversal of 13515231215 is 51213251531.

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 13515231215 - 2¹⁶ = 13515165679 is a prime.

It is a super-2 number, since 2×13515231215² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7549514 + ... + 7551303.

It is an arithmetic number, because the mean of its divisors is an integer number (2038610430).

Almost surely, 2^13515231215 is an apocalyptic number.

13515231215 is a deficient number, since it is larger than the sum of its proper divisors (2793652225).

13515231215 is a wasteful number, since it uses less digits than its factorization.

13515231215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15101001.

The product of its digits is 4500, while the sum is 29.

Adding to 13515231215 its reverse (51213251531), we get a palindrome (64728482746).

The spelling of 13515231215 in words is "thirteen billion, five hundred fifteen million, two hundred thirty-one thousand, two hundred fifteen".