169988813 has 2 divisors, whose sum is σ = 169988814. Its totient is φ = 169988812.

The previous prime is 169988789. The next prime is 169988857. The reversal of 169988813 is 318889961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134977924 + 35010889 = 11618^2 + 5917^2 .

It is a cyclic number.

It is not a de Polignac number, because 169988813 - 2²⁶ = 102879949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169988873) 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, 84994406 + 84994407.

It is an arithmetic number, because the mean of its divisors is an integer number (84994407).

Almost surely, 2^169988813 is an apocalyptic number.

It is an amenable number.

169988813 is a deficient number, since it is larger than the sum of its proper divisors (1).

169988813 is an equidigital number, since it uses as much as digits as its factorization.

169988813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 53.

The square root of 169988813 is about 13037.9758014808. The cubic root of 169988813 is about 553.9536740056.

The spelling of 169988813 in words is "one hundred sixty-nine million, nine hundred eighty-eight thousand, eight hundred thirteen".