521411857 has 2 divisors, whose sum is σ = 521411858. Its totient is φ = 521411856.

The previous prime is 521411831. The next prime is 521411861. The reversal of 521411857 is 758114125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 452455441 + 68956416 = 21271^2 + 8304^2 .

It is a cyclic number.

It is not a de Polignac number, because 521411857 - 2¹⁹ = 520887569 is a prime.

It is not a weakly prime, because it can be changed into another prime (521411557) 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, 260705928 + 260705929.

It is an arithmetic number, because the mean of its divisors is an integer number (260705929).

Almost surely, 2^521411857 is an apocalyptic number.

It is an amenable number.

521411857 is a deficient number, since it is larger than the sum of its proper divisors (1).

521411857 is an equidigital number, since it uses as much as digits as its factorization.

521411857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11200, while the sum is 34.

The square root of 521411857 is about 22834.4445301391. Note that the first 3 decimals coincide. The cubic root of 521411857 is about 804.8722747859.

It can be divided in two parts, 5214 and 11857, that added together give a palindrome (17071).

The spelling of 521411857 in words is "five hundred twenty-one million, four hundred eleven thousand, eight hundred fifty-seven".