168378109 has 2 divisors, whose sum is σ = 168378110. Its totient is φ = 168378108.

The previous prime is 168378073. The next prime is 168378113. The reversal of 168378109 is 901873861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103124025 + 65254084 = 10155^2 + 8078^2 .

It is a cyclic number.

It is not a de Polignac number, because 168378109 - 2¹³ = 168369917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168318109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84189054 + 84189055.

It is an arithmetic number, because the mean of its divisors is an integer number (84189055).

Almost surely, 2^168378109 is an apocalyptic number.

It is an amenable number.

168378109 is a deficient number, since it is larger than the sum of its proper divisors (1).

168378109 is an equidigital number, since it uses as much as digits as its factorization.

168378109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 168378109 is about 12976.0590704574. The cubic root of 168378109 is about 552.1984830668.

The spelling of 168378109 in words is "one hundred sixty-eight million, three hundred seventy-eight thousand, one hundred nine".