520149647 has 2 divisors, whose sum is σ = 520149648. Its totient is φ = 520149646.

The previous prime is 520149593. The next prime is 520149649. The reversal of 520149647 is 746941025.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520149647 is a prime.

Together with 520149649, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 520149647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520149649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260074823 + 260074824.

It is an arithmetic number, because the mean of its divisors is an integer number (260074824).

Almost surely, 2^520149647 is an apocalyptic number.

520149647 is a deficient number, since it is larger than the sum of its proper divisors (1).

520149647 is an equidigital number, since it uses as much as digits as its factorization.

520149647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 520149647 is about 22806.7894934820. The cubic root of 520149647 is about 804.2222840048. Note that the first 4 decimals are identical.

The spelling of 520149647 in words is "five hundred twenty million, one hundred forty-nine thousand, six hundred forty-seven".