1001243 has 4 divisors (see below), whose sum is σ = 1053960. Its totient is φ = 948528.

The previous prime is 1001237. The next prime is 1001267. The reversal of 1001243 is 3421001.

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: 3421001 = 191 ⋅17911.

It is a cyclic number.

It is not a de Polignac number, because 1001243 - 2¹² = 997147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001743) 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, 26330 + ... + 26367.

It is an arithmetic number, because the mean of its divisors is an integer number (263490).

2^1001243 is an apocalyptic number.

1001243 is a deficient number, since it is larger than the sum of its proper divisors (52717).

1001243 is an equidigital number, since it uses as much as digits as its factorization.

1001243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52716.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1001243 is about 1000.6213069888. The cubic root of 1001243 is about 100.0414161780.

Adding to 1001243 its reverse (3421001), we get a palindrome (4422244).

The spelling of 1001243 in words is "one million, one thousand, two hundred forty-three".