169988449 has 2 divisors, whose sum is σ = 169988450. Its totient is φ = 169988448.

The previous prime is 169988431. The next prime is 169988473. The reversal of 169988449 is 944889961.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139074849 + 30913600 = 11793^2 + 5560^2 .

It is an emirp because it is prime and its reverse (944889961) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169988449 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 169988393 and 169988402.

It is not a weakly prime, because it can be changed into another prime (169988479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84994224 + 84994225.

It is an arithmetic number, because the mean of its divisors is an integer number (84994225).

Almost surely, 2^169988449 is an apocalyptic number.

It is an amenable number.

169988449 is a deficient number, since it is larger than the sum of its proper divisors (1).

169988449 is an equidigital number, since it uses as much as digits as its factorization.

169988449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4478976, while the sum is 58.

The square root of 169988449 is about 13037.9618422513. The cubic root of 169988449 is about 553.9532786084.

The spelling of 169988449 in words is "one hundred sixty-nine million, nine hundred eighty-eight thousand, four hundred forty-nine".