168420533 has 2 divisors, whose sum is σ = 168420534. Its totient is φ = 168420532.

The previous prime is 168420523. The next prime is 168420557. The reversal of 168420533 is 335024861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143089444 + 25331089 = 11962^2 + 5033^2 .

It is a cyclic number.

It is not a de Polignac number, because 168420533 - 2⁸ = 168420277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 168420533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168420523) 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, 84210266 + 84210267.

It is an arithmetic number, because the mean of its divisors is an integer number (84210267).

Almost surely, 2^168420533 is an apocalyptic number.

It is an amenable number.

168420533 is a deficient number, since it is larger than the sum of its proper divisors (1).

168420533 is an equidigital number, since it uses as much as digits as its factorization.

168420533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 168420533 is about 12977.6936702944. The cubic root of 168420533 is about 552.2448558829.

The spelling of 168420533 in words is "one hundred sixty-eight million, four hundred twenty thousand, five hundred thirty-three".