169922989 has 2 divisors, whose sum is σ = 169922990. Its totient is φ = 169922988.

The previous prime is 169922923. The next prime is 169923029. The reversal of 169922989 is 989229961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152324964 + 17598025 = 12342^2 + 4195^2 .

It is an emirp because it is prime and its reverse (989229961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 169922989 - 2¹⁵ = 169890221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (169925989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84961494 + 84961495.

It is an arithmetic number, because the mean of its divisors is an integer number (84961495).

Almost surely, 2^169922989 is an apocalyptic number.

It is an amenable number.

169922989 is a deficient number, since it is larger than the sum of its proper divisors (1).

169922989 is an equidigital number, since it uses as much as digits as its factorization.

169922989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 55.

The square root of 169922989 is about 13035.4512388333. The cubic root of 169922989 is about 553.8821631151.

The spelling of 169922989 in words is "one hundred sixty-nine million, nine hundred twenty-two thousand, nine hundred eighty-nine".