13215191 has 4 divisors (see below), whose sum is σ = 14416584. Its totient is φ = 12013800.

The previous prime is 13215187. The next prime is 13215193. The reversal of 13215191 is 19151231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13215191 - 2² = 13215187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600680 + ... + 600701.

It is an arithmetic number, because the mean of its divisors is an integer number (3604146).

Almost surely, 2^13215191 is an apocalyptic number.

13215191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13215191 is a deficient number, since it is larger than the sum of its proper divisors (1201393).

13215191 is a wasteful number, since it uses less digits than its factorization.

13215191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201392.

The product of its digits is 270, while the sum is 23.

The square root of 13215191 is about 3635.2704163514. The cubic root of 13215191 is about 236.4237753598.

The spelling of 13215191 in words is "thirteen million, two hundred fifteen thousand, one hundred ninety-one".