521425441 has 2 divisors, whose sum is σ = 521425442. Its totient is φ = 521425440.

The previous prime is 521425403. The next prime is 521425447. The reversal of 521425441 is 144524125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372683025 + 148742416 = 19305^2 + 12196^2 .

It is a cyclic number.

It is not a de Polignac number, because 521425441 - 2²¹ = 519328289 is a prime.

It is not a weakly prime, because it can be changed into another prime (521425447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260712720 + 260712721.

It is an arithmetic number, because the mean of its divisors is an integer number (260712721).

Almost surely, 2^521425441 is an apocalyptic number.

It is an amenable number.

521425441 is a deficient number, since it is larger than the sum of its proper divisors (1).

521425441 is an equidigital number, since it uses as much as digits as its factorization.

521425441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6400, while the sum is 28.

The square root of 521425441 is about 22834.7419735805. The cubic root of 521425441 is about 804.8792643278.

Adding to 521425441 its reverse (144524125), we get a palindrome (665949566).

The spelling of 521425441 in words is "five hundred twenty-one million, four hundred twenty-five thousand, four hundred forty-one".