521245457 has 2 divisors, whose sum is σ = 521245458. Its totient is φ = 521245456.

The previous prime is 521245451. The next prime is 521245489. The reversal of 521245457 is 754542125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313856656 + 207388801 = 17716^2 + 14401^2 .

It is a cyclic number.

It is not a de Polignac number, because 521245457 - 2⁶ = 521245393 is a prime.

It is not a weakly prime, because it can be changed into another prime (521245451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260622728 + 260622729.

It is an arithmetic number, because the mean of its divisors is an integer number (260622729).

Almost surely, 2^521245457 is an apocalyptic number.

It is an amenable number.

521245457 is a deficient number, since it is larger than the sum of its proper divisors (1).

521245457 is an equidigital number, since it uses as much as digits as its factorization.

521245457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56000, while the sum is 35.

The square root of 521245457 is about 22830.8006210908. The cubic root of 521245457 is about 804.7866451028.

The spelling of 521245457 in words is "five hundred twenty-one million, two hundred forty-five thousand, four hundred fifty-seven".