15243691 has 4 divisors (see below), whose sum is σ = 15391792. Its totient is φ = 15095592.

The previous prime is 15243689. The next prime is 15243703. The reversal of 15243691 is 19634251.

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 15243691 - 2¹ = 15243689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15243671) 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, 73896 + ... + 74101.

It is an arithmetic number, because the mean of its divisors is an integer number (3847948).

Almost surely, 2^15243691 is an apocalyptic number.

15243691 is a deficient number, since it is larger than the sum of its proper divisors (148101).

15243691 is a wasteful number, since it uses less digits than its factorization.

15243691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148100.

The product of its digits is 6480, while the sum is 31.

The square root of 15243691 is about 3904.3169697144. The cubic root of 15243691 is about 247.9495811049.

The spelling of 15243691 in words is "fifteen million, two hundred forty-three thousand, six hundred ninety-one".