840634115369 has 2 divisors, whose sum is σ = 840634115370. Its totient is φ = 840634115368.

The previous prime is 840634115311. The next prime is 840634115383. The reversal of 840634115369 is 963511436048.

840634115369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 783954409744 + 56679705625 = 885412^2 + 238075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840634115369 is a prime.

It is a super-2 number, since 2×840634115369² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (840634115389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420317057684 + 420317057685.

It is an arithmetic number, because the mean of its divisors is an integer number (420317057685).

Almost surely, 2^840634115369 is an apocalyptic number.

It is an amenable number.

840634115369 is a deficient number, since it is larger than the sum of its proper divisors (1).

840634115369 is an equidigital number, since it uses as much as digits as its factorization.

840634115369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 840634115369 in words is "eight hundred forty billion, six hundred thirty-four million, one hundred fifteen thousand, three hundred sixty-nine".