156243 has 4 divisors (see below), whose sum is σ = 208328. Its totient is φ = 104160.

The previous prime is 156241. The next prime is 156253. The reversal of 156243 is 342651.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342651 = 3 ⋅114217.

It is not a de Polignac number, because 156243 - 2¹ = 156241 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156241) 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, 26038 + ... + 26043.

It is an arithmetic number, because the mean of its divisors is an integer number (52082).

156243 is a Friedman number, since it can be written as 5^(6+1)*2-4-3, using all its digits and the basic arithmetic operations.

2¹⁵⁶²⁴³ is an apocalyptic number.

156243 is a deficient number, since it is larger than the sum of its proper divisors (52085).

156243 is an equidigital number, since it uses as much as digits as its factorization.

156243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52084.

The product of its digits is 720, while the sum is 21.

The square root of 156243 is about 395.2758530444. The cubic root of 156243 is about 53.8600629165.

Adding to 156243 its reverse (342651), we get a palindrome (498894).

The spelling of 156243 in words is "one hundred fifty-six thousand, two hundred forty-three".