169907989 has 2 divisors, whose sum is σ = 169907990. Its totient is φ = 169907988.

The previous prime is 169907953. The next prime is 169908017. The reversal of 169907989 is 989709961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165251025 + 4656964 = 12855^2 + 2158^2 .

It is a cyclic number.

It is not a de Polignac number, because 169907989 - 2¹⁵ = 169875221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169907909) 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, 84953994 + 84953995.

It is an arithmetic number, because the mean of its divisors is an integer number (84953995).

Almost surely, 2^169907989 is an apocalyptic number.

It is an amenable number.

169907989 is a deficient number, since it is larger than the sum of its proper divisors (1).

169907989 is an equidigital number, since it uses as much as digits as its factorization.

169907989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 58.

The square root of 169907989 is about 13034.8758720595. The cubic root of 169907989 is about 553.8658646005.

The spelling of 169907989 in words is "one hundred sixty-nine million, nine hundred seven thousand, nine hundred eighty-nine".