1243240241 has 4 divisors (see below), whose sum is σ = 1244521584. Its totient is φ = 1241958900.

The previous prime is 1243240217. The next prime is 1243240247. The reversal of 1243240241 is 1420423421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1243240241 - 2⁶ = 1243240177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243240247) 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, 639215 + ... + 641156.

It is an arithmetic number, because the mean of its divisors is an integer number (311130396).

Almost surely, 2^1243240241 is an apocalyptic number.

It is an amenable number.

1243240241 is a deficient number, since it is larger than the sum of its proper divisors (1281343).

1243240241 is an equidigital number, since it uses as much as digits as its factorization.

1243240241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281342.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1243240241 is about 35259.6120370035. The cubic root of 1243240241 is about 1075.2720396068.

Adding to 1243240241 its reverse (1420423421), we get a palindrome (2663663662).

The spelling of 1243240241 in words is "one billion, two hundred forty-three million, two hundred forty thousand, two hundred forty-one".