1240343331431 has 2 divisors, whose sum is σ = 1240343331432. Its totient is φ = 1240343331430.

The previous prime is 1240343331287. The next prime is 1240343331439. The reversal of 1240343331431 is 1341333430421.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1341333430421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240343331431 - 2²² = 1240339137127 is a prime.

It is a super-2 number, since 2×1240343331431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240343331439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620171665715 + 620171665716.

It is an arithmetic number, because the mean of its divisors is an integer number (620171665716).

Almost surely, 2^{1240343331431} is an apocalyptic number.

1240343331431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240343331431 is an equidigital number, since it uses as much as digits as its factorization.

1240343331431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 32.

Adding to 1240343331431 its reverse (1341333430421), we get a palindrome (2581676761852).

The spelling of 1240343331431 in words is "one trillion, two hundred forty billion, three hundred forty-three million, three hundred thirty-one thousand, four hundred thirty-one".