169920973 has 2 divisors, whose sum is σ = 169920974. Its totient is φ = 169920972.

The previous prime is 169920953. The next prime is 169920991. The reversal of 169920973 is 379029961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159693769 + 10227204 = 12637^2 + 3198^2 .

It is a cyclic number.

It is not a de Polignac number, because 169920973 - 2⁹ = 169920461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169920913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84960486 + 84960487.

It is an arithmetic number, because the mean of its divisors is an integer number (84960487).

Almost surely, 2^169920973 is an apocalyptic number.

It is an amenable number.

169920973 is a deficient number, since it is larger than the sum of its proper divisors (1).

169920973 is an equidigital number, since it uses as much as digits as its factorization.

169920973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 169920973 is about 13035.3739110161. The cubic root of 169920973 is about 553.8799726505.

The spelling of 169920973 in words is "one hundred sixty-nine million, nine hundred twenty thousand, nine hundred seventy-three".