826787813 has 2 divisors, whose sum is σ = 826787814. Its totient is φ = 826787812.

The previous prime is 826787791. The next prime is 826787821. The reversal of 826787813 is 318787628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 559890244 + 266897569 = 23662^2 + 16337^2 .

It is a cyclic number.

It is not a de Polignac number, because 826787813 - 2¹² = 826783717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (826787873) 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, 413393906 + 413393907.

It is an arithmetic number, because the mean of its divisors is an integer number (413393907).

Almost surely, 2^826787813 is an apocalyptic number.

It is an amenable number.

826787813 is a deficient number, since it is larger than the sum of its proper divisors (1).

826787813 is an equidigital number, since it uses as much as digits as its factorization.

826787813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 50.

The square root of 826787813 is about 28753.9182199574. The cubic root of 826787813 is about 938.5657215839.

The spelling of 826787813 in words is "eight hundred twenty-six million, seven hundred eighty-seven thousand, eight hundred thirteen".