1311440241 has 4 divisors (see below), whose sum is σ = 1748586992. Its totient is φ = 874293492.

The previous prime is 1311440239. The next prime is 1311440293. The reversal of 1311440241 is 1420441131.

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 not a de Polignac number, because 1311440241 - 2¹ = 1311440239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311440041) 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, 218573371 + ... + 218573376.

It is an arithmetic number, because the mean of its divisors is an integer number (437146748).

Almost surely, 2^1311440241 is an apocalyptic number.

It is an amenable number.

1311440241 is a deficient number, since it is larger than the sum of its proper divisors (437146751).

1311440241 is an equidigital number, since it uses as much as digits as its factorization.

1311440241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437146750.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1311440241 is about 36213.8128481385. The cubic root of 1311440241 is about 1094.5850240481.

Adding to 1311440241 its reverse (1420441131), we get a palindrome (2731881372).

The spelling of 1311440241 in words is "one billion, three hundred eleven million, four hundred forty thousand, two hundred forty-one".