521794292869 has 2 divisors, whose sum is σ = 521794292870. Its totient is φ = 521794292868.

The previous prime is 521794292849. The next prime is 521794292933. The reversal of 521794292869 is 968292497125.

It is a happy number.

It is an a-pointer prime, because the next prime (521794292933) can be obtained adding 521794292869 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376152835969 + 145641456900 = 613313^2 + 381630^2 .

It is a cyclic number.

It is not a de Polignac number, because 521794292869 - 2¹³ = 521794284677 is a prime.

It is a super-2 number, since 2×521794292869² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521794292869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521794292849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260897146434 + 260897146435.

It is an arithmetic number, because the mean of its divisors is an integer number (260897146435).

Almost surely, 2^521794292869 is an apocalyptic number.

It is an amenable number.

521794292869 is a deficient number, since it is larger than the sum of its proper divisors (1).

521794292869 is an equidigital number, since it uses as much as digits as its factorization.

521794292869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39191040, while the sum is 64.

The spelling of 521794292869 in words is "five hundred twenty-one billion, seven hundred ninety-four million, two hundred ninety-two thousand, eight hundred sixty-nine".