168169973 has 2 divisors, whose sum is σ = 168169974. Its totient is φ = 168169972.

The previous prime is 168169909. The next prime is 168169979. The reversal of 168169973 is 379961861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85414564 + 82755409 = 9242^2 + 9097^2 .

It is a cyclic number.

It is not a de Polignac number, because 168169973 - 2⁶ = 168169909 is a prime.

It is a super-2 number, since 2×168169973² = 56562279637641458, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168169979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84084986 + 84084987.

It is an arithmetic number, because the mean of its divisors is an integer number (84084987).

Almost surely, 2^168169973 is an apocalyptic number.

It is an amenable number.

168169973 is a deficient number, since it is larger than the sum of its proper divisors (1).

168169973 is an equidigital number, since it uses as much as digits as its factorization.

168169973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 168169973 is about 12968.0365900162. The cubic root of 168169973 is about 551.9708608944.

The spelling of 168169973 in words is "one hundred sixty-eight million, one hundred sixty-nine thousand, nine hundred seventy-three".