169899973 has 2 divisors, whose sum is σ = 169899974. Its totient is φ = 169899972.

The previous prime is 169899937. The next prime is 169899979. The reversal of 169899973 is 379998961.

Together with previous prime (169899937) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169468324 + 431649 = 13018^2 + 657^2 .

It is a cyclic number.

It is not a de Polignac number, because 169899973 - 2²¹ = 167802821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169899979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84949986 + 84949987.

It is an arithmetic number, because the mean of its divisors is an integer number (84949987).

Almost surely, 2^169899973 is an apocalyptic number.

It is an amenable number.

169899973 is a deficient number, since it is larger than the sum of its proper divisors (1).

169899973 is an equidigital number, since it uses as much as digits as its factorization.

169899973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6613488, while the sum is 61.

The square root of 169899973 is about 13034.5683856428. The cubic root of 169899973 is about 553.8571542811.

It can be divided in two parts, 16989 and 9973, that added together give a palindrome (26962).

The spelling of 169899973 in words is "one hundred sixty-nine million, eight hundred ninety-nine thousand, nine hundred seventy-three".