1042340541391 has 2 divisors, whose sum is σ = 1042340541392. Its totient is φ = 1042340541390.

The previous prime is 1042340541331. The next prime is 1042340541461. The reversal of 1042340541391 is 1931450432401.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1042340541391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1042340541391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1042340541331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521170270695 + 521170270696.

It is an arithmetic number, because the mean of its divisors is an integer number (521170270696).

Almost surely, 2^{1042340541391} is an apocalyptic number.

1042340541391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042340541391 is an equidigital number, since it uses as much as digits as its factorization.

1042340541391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 1042340541391 its reverse (1931450432401), we get a palindrome (2973790973792).

The spelling of 1042340541391 in words is "one trillion, forty-two billion, three hundred forty million, five hundred forty-one thousand, three hundred ninety-one".