521275627381 has 2 divisors, whose sum is σ = 521275627382. Its totient is φ = 521275627380.

The previous prime is 521275627339. The next prime is 521275627393. The reversal of 521275627381 is 183726572125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331506486756 + 189769140625 = 575766^2 + 435625^2 .

It is a cyclic number.

It is not a de Polignac number, because 521275627381 - 2⁹ = 521275626869 is a prime.

It is a super-2 number, since 2×521275627381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521275627321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260637813690 + 260637813691.

It is an arithmetic number, because the mean of its divisors is an integer number (260637813691).

Almost surely, 2^521275627381 is an apocalyptic number.

It is an amenable number.

521275627381 is a deficient number, since it is larger than the sum of its proper divisors (1).

521275627381 is an equidigital number, since it uses as much as digits as its factorization.

521275627381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 49.

The spelling of 521275627381 in words is "five hundred twenty-one billion, two hundred seventy-five million, six hundred twenty-seven thousand, three hundred eighty-one".