840318613 has 2 divisors, whose sum is σ = 840318614. Its totient is φ = 840318612.

The previous prime is 840318571. The next prime is 840318617. The reversal of 840318613 is 316813048.

840318613 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., 749554884 + 90763729 = 27378^2 + 9527^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840318613 is a prime.

It is a super-2 number, since 2×840318613² = 1412270742708487538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840318617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420159306 + 420159307.

It is an arithmetic number, because the mean of its divisors is an integer number (420159307).

Almost surely, 2^840318613 is an apocalyptic number.

It is an amenable number.

840318613 is a deficient number, since it is larger than the sum of its proper divisors (1).

840318613 is an equidigital number, since it uses as much as digits as its factorization.

840318613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 840318613 is about 28988.2495677128. The cubic root of 840318613 is about 943.6580761131.

The spelling of 840318613 in words is "eight hundred forty million, three hundred eighteen thousand, six hundred thirteen".