521275938977 has 2 divisors, whose sum is σ = 521275938978. Its totient is φ = 521275938976.

The previous prime is 521275938947. The next prime is 521275938983. The reversal of 521275938977 is 779839572125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498109881361 + 23166057616 = 705769^2 + 152204^2 .

It is a cyclic number.

It is not a de Polignac number, because 521275938977 - 2¹⁰ = 521275937953 is a prime.

It is not a weakly prime, because it can be changed into another prime (521275938907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260637969488 + 260637969489.

It is an arithmetic number, because the mean of its divisors is an integer number (260637969489).

Almost surely, 2^521275938977 is an apocalyptic number.

It is an amenable number.

521275938977 is a deficient number, since it is larger than the sum of its proper divisors (1).

521275938977 is an equidigital number, since it uses as much as digits as its factorization.

521275938977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66679200, while the sum is 65.

The spelling of 521275938977 in words is "five hundred twenty-one billion, two hundred seventy-five million, nine hundred thirty-eight thousand, nine hundred seventy-seven".