13215131 has 8 divisors (see below), whose sum is σ = 13547520. Its totient is φ = 12884968.

The previous prime is 13215121. The next prime is 13215151. The reversal of 13215131 is 13151231.

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 13215131 - 2¹⁴ = 13198747 is a prime.

It is a super-2 number, since 2×13215131² = 349279374694322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13215121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22220 + ... + 22806.

It is an arithmetic number, because the mean of its divisors is an integer number (1693440).

Almost surely, 2^13215131 is an apocalyptic number.

13215131 is a deficient number, since it is larger than the sum of its proper divisors (332389).

13215131 is an equidigital number, since it uses as much as digits as its factorization.

13215131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113.

The product of its digits is 90, while the sum is 17.

The square root of 13215131 is about 3635.2621638611. The cubic root of 13215131 is about 236.4234175532.

Adding to 13215131 its reverse (13151231), we get a palindrome (26366362).

The spelling of 13215131 in words is "thirteen million, two hundred fifteen thousand, one hundred thirty-one".