521054839 has 2 divisors, whose sum is σ = 521054840. Its totient is φ = 521054838.

The previous prime is 521054837. The next prime is 521054869. The reversal of 521054839 is 938450125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521054839 - 2¹ = 521054837 is a prime.

Together with 521054837, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 521054798 and 521054807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521054837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260527419 + 260527420.

It is an arithmetic number, because the mean of its divisors is an integer number (260527420).

Almost surely, 2^521054839 is an apocalyptic number.

521054839 is a deficient number, since it is larger than the sum of its proper divisors (1).

521054839 is an equidigital number, since it uses as much as digits as its factorization.

521054839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 521054839 is about 22826.6256595231. The cubic root of 521054839 is about 804.6885304029.

The spelling of 521054839 in words is "five hundred twenty-one million, fifty-four thousand, eight hundred thirty-nine".