168215953 has 2 divisors, whose sum is σ = 168215954. Its totient is φ = 168215952.

The previous prime is 168215941. The next prime is 168215977. The reversal of 168215953 is 359512861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141919569 + 26296384 = 11913^2 + 5128^2 .

It is an emirp because it is prime and its reverse (359512861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168215953 is a prime.

It is not a weakly prime, because it can be changed into another prime (168215753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84107976 + 84107977.

It is an arithmetic number, because the mean of its divisors is an integer number (84107977).

Almost surely, 2^168215953 is an apocalyptic number.

It is an amenable number.

168215953 is a deficient number, since it is larger than the sum of its proper divisors (1).

168215953 is an equidigital number, since it uses as much as digits as its factorization.

168215953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 40.

The square root of 168215953 is about 12969.8092892687. The cubic root of 168215953 is about 552.0211618034.

The spelling of 168215953 in words is "one hundred sixty-eight million, two hundred fifteen thousand, nine hundred fifty-three".