521382649 has 2 divisors, whose sum is σ = 521382650. Its totient is φ = 521382648.

The previous prime is 521382637. The next prime is 521382671. The reversal of 521382649 is 946283125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505125625 + 16257024 = 22475^2 + 4032^2 .

It is a cyclic number.

It is not a de Polignac number, because 521382649 - 2⁹ = 521382137 is a prime.

It is not a weakly prime, because it can be changed into another prime (521382679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260691324 + 260691325.

It is an arithmetic number, because the mean of its divisors is an integer number (260691325).

Almost surely, 2^521382649 is an apocalyptic number.

It is an amenable number.

521382649 is a deficient number, since it is larger than the sum of its proper divisors (1).

521382649 is an equidigital number, since it uses as much as digits as its factorization.

521382649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 521382649 is about 22833.8049610660. The cubic root of 521382649 is about 804.8572456248.

The spelling of 521382649 in words is "five hundred twenty-one million, three hundred eighty-two thousand, six hundred forty-nine".