520649407 has 2 divisors, whose sum is σ = 520649408. Its totient is φ = 520649406.

The previous prime is 520649401. The next prime is 520649491. The reversal of 520649407 is 704946025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520649407 - 2¹¹ = 520647359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520649401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260324703 + 260324704.

It is an arithmetic number, because the mean of its divisors is an integer number (260324704).

Almost surely, 2^520649407 is an apocalyptic number.

520649407 is a deficient number, since it is larger than the sum of its proper divisors (1).

520649407 is an equidigital number, since it uses as much as digits as its factorization.

520649407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 520649407 is about 22817.7432494977. The cubic root of 520649407 is about 804.4797672621.

The spelling of 520649407 in words is "five hundred twenty million, six hundred forty-nine thousand, four hundred seven".