168494009 has 2 divisors, whose sum is σ = 168494010. Its totient is φ = 168494008.

The previous prime is 168494003. The next prime is 168494023. The reversal of 168494009 is 900494861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165688384 + 2805625 = 12872^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 168494009 - 2¹⁶ = 168428473 is a prime.

It is not a weakly prime, because it can be changed into another prime (168494003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84247004 + 84247005.

It is an arithmetic number, because the mean of its divisors is an integer number (84247005).

Almost surely, 2^168494009 is an apocalyptic number.

It is an amenable number.

168494009 is a deficient number, since it is larger than the sum of its proper divisors (1).

168494009 is an equidigital number, since it uses as much as digits as its factorization.

168494009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 168494009 is about 12980.5242189982. The cubic root of 168494009 is about 552.3251525922.

The spelling of 168494009 in words is "one hundred sixty-eight million, four hundred ninety-four thousand, nine".