1240342031 has 2 divisors, whose sum is σ = 1240342032. Its totient is φ = 1240342030.

The previous prime is 1240342001. The next prime is 1240342039. The reversal of 1240342031 is 1302430421.

It is a strong prime.

It is an emirp because it is prime and its reverse (1302430421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240342031 is a prime.

It is a super-2 number, since 2×1240342031² = 3076896707730409922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1240341994 and 1240342012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240342039) 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, 620171015 + 620171016.

It is an arithmetic number, because the mean of its divisors is an integer number (620171016).

Almost surely, 2^1240342031 is an apocalyptic number.

1240342031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240342031 is an equidigital number, since it uses as much as digits as its factorization.

1240342031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1240342031 is about 35218.4899023226. The cubic root of 1240342031 is about 1074.4358405595.

Adding to 1240342031 its reverse (1302430421), we get a palindrome (2542772452).

The spelling of 1240342031 in words is "one billion, two hundred forty million, three hundred forty-two thousand, thirty-one".