801956789 has 2 divisors, whose sum is σ = 801956790. Its totient is φ = 801956788.

The previous prime is 801956783. The next prime is 801956803. The reversal of 801956789 is 987659108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 742126564 + 59830225 = 27242^2 + 7735^2 .

It is a cyclic number.

It is not a de Polignac number, because 801956789 - 2¹² = 801952693 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 801956789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (801956783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400978394 + 400978395.

It is an arithmetic number, because the mean of its divisors is an integer number (400978395).

Almost surely, 2^801956789 is an apocalyptic number.

It is an amenable number.

801956789 is a deficient number, since it is larger than the sum of its proper divisors (1).

801956789 is an equidigital number, since it uses as much as digits as its factorization.

801956789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 801956789 is about 28318.8415900086. The cubic root of 801956789 is about 929.0740346147.

The spelling of 801956789 in words is "eight hundred one million, nine hundred fifty-six thousand, seven hundred eighty-nine".