168400481 has 2 divisors, whose sum is σ = 168400482. Its totient is φ = 168400480.

The previous prime is 168400423. The next prime is 168400493. The reversal of 168400481 is 184004861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98109025 + 70291456 = 9905^2 + 8384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168400481 is a prime.

It is a super-2 number, since 2×168400481² = 56717444002062722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168400381) 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, 84200240 + 84200241.

It is an arithmetic number, because the mean of its divisors is an integer number (84200241).

Almost surely, 2^168400481 is an apocalyptic number.

It is an amenable number.

168400481 is a deficient number, since it is larger than the sum of its proper divisors (1).

168400481 is an equidigital number, since it uses as much as digits as its factorization.

168400481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 168400481 is about 12976.9210909214. The cubic root of 168400481 is about 552.2229384180. Note that the first 3 decimals are identical.

The spelling of 168400481 in words is "one hundred sixty-eight million, four hundred thousand, four hundred eighty-one".