3121243 has 4 divisors (see below), whose sum is σ = 3125680. Its totient is φ = 3116808.

The previous prime is 3121229. The next prime is 3121249. The reversal of 3121243 is 3421213.

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: 3421213 = 619 ⋅5527.

It is a cyclic number.

It is not a de Polignac number, because 3121243 - 2²¹ = 1024091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121249) 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, 903 + ... + 2656.

It is an arithmetic number, because the mean of its divisors is an integer number (781420).

Almost surely, 2^3121243 is an apocalyptic number.

3121243 is a deficient number, since it is larger than the sum of its proper divisors (4437).

3121243 is an equidigital number, since it uses as much as digits as its factorization.

3121243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4436.

The product of its digits is 144, while the sum is 16.

The square root of 3121243 is about 1766.7039933164. The cubic root of 3121243 is about 146.1422738973.

Adding to 3121243 its reverse (3421213), we get a palindrome (6542456).

It can be divided in two parts, 3121 and 243, that added together give a square (3364 = 58²).

The spelling of 3121243 in words is "three million, one hundred twenty-one thousand, two hundred forty-three".