340240421581 has 2 divisors, whose sum is σ = 340240421582. Its totient is φ = 340240421580.

The previous prime is 340240421501. The next prime is 340240421611. The reversal of 340240421581 is 185124042043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203716822500 + 136523599081 = 451350^2 + 369491^2 .

It is an emirp because it is prime and its reverse (185124042043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340240421581 - 2⁹ = 340240421069 is a prime.

It is a super-2 number, since 2×340240421581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340240421501) 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, 170120210790 + 170120210791.

It is an arithmetic number, because the mean of its divisors is an integer number (170120210791).

Almost surely, 2^340240421581 is an apocalyptic number.

It is an amenable number.

340240421581 is a deficient number, since it is larger than the sum of its proper divisors (1).

340240421581 is an equidigital number, since it uses as much as digits as its factorization.

340240421581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30720, while the sum is 34.

The spelling of 340240421581 in words is "three hundred forty billion, two hundred forty million, four hundred twenty-one thousand, five hundred eighty-one".