13215291 has 4 divisors (see below), whose sum is σ = 17620392. Its totient is φ = 8810192.

The previous prime is 13215287. The next prime is 13215311. The reversal of 13215291 is 19251231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19251231 = 3 ⋅6417077.

It is a cyclic number.

It is not a de Polignac number, because 13215291 - 2² = 13215287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13215221) 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 3 ways as a sum of consecutive naturals, for example, 2202546 + ... + 2202551.

It is an arithmetic number, because the mean of its divisors is an integer number (4405098).

Almost surely, 2^13215291 is an apocalyptic number.

13215291 is a deficient number, since it is larger than the sum of its proper divisors (4405101).

13215291 is an equidigital number, since it uses as much as digits as its factorization.

13215291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405100.

The product of its digits is 540, while the sum is 24.

The square root of 13215291 is about 3635.2841704604. The cubic root of 13215291 is about 236.4243717018.

The spelling of 13215291 in words is "thirteen million, two hundred fifteen thousand, two hundred ninety-one".