13215257 has 12 divisors (see below), whose sum is σ = 14643300. Its totient is φ = 11916960.

The previous prime is 13215247. The next prime is 13215277. The reversal of 13215257 is 75251231.

It can be written as a sum of positive squares in 2 ways, for example, as 7929856 + 5285401 = 2816^2 + 2299^2 .

It is not a de Polignac number, because 13215257 - 2⁶ = 13215193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13215247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17663 + ... + 18395.

It is an arithmetic number, because the mean of its divisors is an integer number (1220275).

Almost surely, 2^13215257 is an apocalyptic number.

It is an amenable number.

13215257 is a deficient number, since it is larger than the sum of its proper divisors (1428043).

13215257 is a wasteful number, since it uses less digits than its factorization.

13215257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904 (or 893 counting only the distinct ones).

The product of its digits is 2100, while the sum is 26.

The square root of 13215257 is about 3635.2794940692. The cubic root of 13215257 is about 236.4241689458.

Adding to 13215257 its reverse (75251231), we get a palindrome (88466488).

The spelling of 13215257 in words is "thirteen million, two hundred fifteen thousand, two hundred fifty-seven".