521359823849 has 2 divisors, whose sum is σ = 521359823850. Its totient is φ = 521359823848.

The previous prime is 521359823843. The next prime is 521359823911. The reversal of 521359823849 is 948328953125.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296785248400 + 224574575449 = 544780^2 + 473893^2 .

It is a cyclic number.

It is not a de Polignac number, because 521359823849 - 2¹⁶ = 521359758313 is a prime.

It is not a weakly prime, because it can be changed into another prime (521359823843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260679911924 + 260679911925.

It is an arithmetic number, because the mean of its divisors is an integer number (260679911925).

Almost surely, 2^521359823849 is an apocalyptic number.

It is an amenable number.

521359823849 is a deficient number, since it is larger than the sum of its proper divisors (1).

521359823849 is an equidigital number, since it uses as much as digits as its factorization.

521359823849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18662400, while the sum is 59.

The spelling of 521359823849 in words is "five hundred twenty-one billion, three hundred fifty-nine million, eight hundred twenty-three thousand, eight hundred forty-nine".