168520013 has 2 divisors, whose sum is σ = 168520014. Its totient is φ = 168520012.

The previous prime is 168520007. The next prime is 168520039. The reversal of 168520013 is 310025861.

It is an a-pointer prime, because the next prime (168520039) can be obtained adding 168520013 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160098409 + 8421604 = 12653^2 + 2902^2 .

It is a cyclic number.

It is not a de Polignac number, because 168520013 - 2¹⁶ = 168454477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168525013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84260006 + 84260007.

It is an arithmetic number, because the mean of its divisors is an integer number (84260007).

Almost surely, 2^168520013 is an apocalyptic number.

It is an amenable number.

168520013 is a deficient number, since it is larger than the sum of its proper divisors (1).

168520013 is an equidigital number, since it uses as much as digits as its factorization.

168520013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 168520013 is about 12981.5258348162. The cubic root of 168520013 is about 552.3535649267.

Adding to 168520013 its reverse (310025861), we get a palindrome (478545874).

The spelling of 168520013 in words is "one hundred sixty-eight million, five hundred twenty thousand, thirteen".