168349681 has 2 divisors, whose sum is σ = 168349682. Its totient is φ = 168349680.

The previous prime is 168349663. The next prime is 168349693. The reversal of 168349681 is 186943861.

168349681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130416400 + 37933281 = 11420^2 + 6159^2 .

It is a cyclic number.

It is not a de Polignac number, because 168349681 - 2¹⁵ = 168316913 is a prime.

It is a super-2 number, since 2×168349681² = 56683230185603522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (168349381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84174840 + 84174841.

It is an arithmetic number, because the mean of its divisors is an integer number (84174841).

Almost surely, 2^168349681 is an apocalyptic number.

It is an amenable number.

168349681 is a deficient number, since it is larger than the sum of its proper divisors (1).

168349681 is an equidigital number, since it uses as much as digits as its factorization.

168349681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 168349681 is about 12974.9636222997. The cubic root of 168349681 is about 552.1674046365.

The spelling of 168349681 in words is "one hundred sixty-eight million, three hundred forty-nine thousand, six hundred eighty-one".