520525639 has 2 divisors, whose sum is σ = 520525640. Its totient is φ = 520525638.

The previous prime is 520525631. The next prime is 520525661. The reversal of 520525639 is 936525025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520525639 - 2³ = 520525631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 520525598 and 520525607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520525631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260262819 + 260262820.

It is an arithmetic number, because the mean of its divisors is an integer number (260262820).

Almost surely, 2^520525639 is an apocalyptic number.

520525639 is a deficient number, since it is larger than the sum of its proper divisors (1).

520525639 is an equidigital number, since it uses as much as digits as its factorization.

520525639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 520525639 is about 22815.0309883638. The cubic root of 520525639 is about 804.4160156337.

The spelling of 520525639 in words is "five hundred twenty million, five hundred twenty-five thousand, six hundred thirty-nine".