168962221 has 2 divisors, whose sum is σ = 168962222. Its totient is φ = 168962220.

The previous prime is 168962219. The next prime is 168962249. The reversal of 168962221 is 122269861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168220900 + 741321 = 12970^2 + 861^2 .

It is a cyclic number.

It is not a de Polignac number, because 168962221 - 2¹ = 168962219 is a prime.

Together with 168962219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168962291) 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, 84481110 + 84481111.

It is an arithmetic number, because the mean of its divisors is an integer number (84481111).

Almost surely, 2^168962221 is an apocalyptic number.

It is an amenable number.

168962221 is a deficient number, since it is larger than the sum of its proper divisors (1).

168962221 is an equidigital number, since it uses as much as digits as its factorization.

168962221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 168962221 is about 12998.5468803247. The cubic root of 168962221 is about 552.8362807467.

The spelling of 168962221 in words is "one hundred sixty-eight million, nine hundred sixty-two thousand, two hundred twenty-one".