169971973 has 2 divisors, whose sum is σ = 169971974. Its totient is φ = 169971972.

The previous prime is 169971947. The next prime is 169971983. The reversal of 169971973 is 379179961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160959969 + 9012004 = 12687^2 + 3002^2 .

It is a cyclic number.

It is not a de Polignac number, because 169971973 - 2²¹ = 167874821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 169971973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169971943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84985986 + 84985987.

It is an arithmetic number, because the mean of its divisors is an integer number (84985987).

Almost surely, 2^169971973 is an apocalyptic number.

It is an amenable number.

169971973 is a deficient number, since it is larger than the sum of its proper divisors (1).

169971973 is an equidigital number, since it uses as much as digits as its factorization.

169971973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 642978, while the sum is 52.

The square root of 169971973 is about 13037.3299797159. The cubic root of 169971973 is about 553.9353808647.

The spelling of 169971973 in words is "one hundred sixty-nine million, nine hundred seventy-one thousand, nine hundred seventy-three".