1240431311 has 4 divisors (see below), whose sum is σ = 1417635792. Its totient is φ = 1063226832.

The previous prime is 1240431301. The next prime is 1240431319. The reversal of 1240431311 is 1131340421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1240431311 - 2¹⁰ = 1240430287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240431319) 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, 88602230 + ... + 88602243.

It is an arithmetic number, because the mean of its divisors is an integer number (354408948).

Almost surely, 2^1240431311 is an apocalyptic number.

1240431311 is a deficient number, since it is larger than the sum of its proper divisors (177204481).

1240431311 is an equidigital number, since it uses as much as digits as its factorization.

1240431311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177204480.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1240431311 is about 35219.7573955301. The cubic root of 1240431311 is about 1074.4616192905.

Adding to 1240431311 its reverse (1131340421), we get a palindrome (2371771732).

The spelling of 1240431311 in words is "one billion, two hundred forty million, four hundred thirty-one thousand, three hundred eleven".