13156243 has 4 divisors (see below), whose sum is σ = 13404528. Its totient is φ = 12907960.

The previous prime is 13156163. The next prime is 13156259. The reversal of 13156243 is 34265131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34265131 = 109 ⋅314359.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13156243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13156043) 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, 124063 + ... + 124168.

It is an arithmetic number, because the mean of its divisors is an integer number (3351132).

Almost surely, 2^13156243 is an apocalyptic number.

13156243 is a deficient number, since it is larger than the sum of its proper divisors (248285).

13156243 is an equidigital number, since it uses as much as digits as its factorization.

13156243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248284.

The product of its digits is 2160, while the sum is 25.

The square root of 13156243 is about 3627.1535671929. The cubic root of 13156243 is about 236.0717188426.

The spelling of 13156243 in words is "thirteen million, one hundred fifty-six thousand, two hundred forty-three".