521118286373 has 2 divisors, whose sum is σ = 521118286374. Its totient is φ = 521118286372.

The previous prime is 521118286327. The next prime is 521118286439. The reversal of 521118286373 is 373682811125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519520925284 + 1597361089 = 720778^2 + 39967^2 .

It is a cyclic number.

It is not a de Polignac number, because 521118286373 - 2⁶ = 521118286309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521118286303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260559143186 + 260559143187.

It is an arithmetic number, because the mean of its divisors is an integer number (260559143187).

Almost surely, 2^521118286373 is an apocalyptic number.

It is an amenable number.

521118286373 is a deficient number, since it is larger than the sum of its proper divisors (1).

521118286373 is an equidigital number, since it uses as much as digits as its factorization.

521118286373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 47.

The spelling of 521118286373 in words is "five hundred twenty-one billion, one hundred eighteen million, two hundred eighty-six thousand, three hundred seventy-three".