13215315231 has 6 divisors (see below), whose sum is σ = 19088788680. Its totient is φ = 8810210148.

The previous prime is 13215315227. The next prime is 13215315251. The reversal of 13215315231 is 13251351231.

13215315231 is a `hidden beast` number, since 1 + 321 + 5 + 315 + 23 + 1 = 666.

It is not a de Polignac number, because 13215315231 - 2² = 13215315227 is a prime.

It is a super-2 number, since 2×13215315231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13215315195 and 13215315204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215315251) 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 5 ways as a sum of consecutive naturals, for example, 734184171 + ... + 734184188.

It is an arithmetic number, because the mean of its divisors is an integer number (3181464780).

Almost surely, 2^13215315231 is an apocalyptic number.

13215315231 is a deficient number, since it is larger than the sum of its proper divisors (5873473449).

13215315231 is a wasteful number, since it uses less digits than its factorization.

13215315231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468368365 (or 1468368362 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

Adding to 13215315231 its reverse (13251351231), we get a palindrome (26466666462).

The spelling of 13215315231 in words is "thirteen billion, two hundred fifteen million, three hundred fifteen thousand, two hundred thirty-one".