15243391 has 4 divisors (see below), whose sum is σ = 15284632. Its totient is φ = 15202152.

The previous prime is 15243379. The next prime is 15243401. The reversal of 15243391 is 19334251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19334251 = 349 ⋅55399.

It is a cyclic number.

It is not a de Polignac number, because 15243391 - 2⁵ = 15243359 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 (15243311) 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, 20061 + ... + 20806.

It is an arithmetic number, because the mean of its divisors is an integer number (3821158).

Almost surely, 2^15243391 is an apocalyptic number.

15243391 is a deficient number, since it is larger than the sum of its proper divisors (41241).

15243391 is an equidigital number, since it uses as much as digits as its factorization.

15243391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41240.

The product of its digits is 3240, while the sum is 28.

The square root of 15243391 is about 3904.2785505135. The cubic root of 15243391 is about 247.9479545224.

The spelling of 15243391 in words is "fifteen million, two hundred forty-three thousand, three hundred ninety-one".