169523989 has 4 divisors (see below), whose sum is σ = 169776556. Its totient is φ = 169271424.

The previous prime is 169523987. The next prime is 169523999. The reversal of 169523989 is 989325961.

169523989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83868964 + 85655025 = 9158^2 + 9255^2 .

It is a cyclic number.

It is not a de Polignac number, because 169523989 - 2¹ = 169523987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169523987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125274 + ... + 126619.

It is an arithmetic number, because the mean of its divisors is an integer number (42444139).

Almost surely, 2^169523989 is an apocalyptic number.

It is an amenable number.

169523989 is a deficient number, since it is larger than the sum of its proper divisors (252567).

169523989 is an equidigital number, since it uses as much as digits as its factorization.

169523989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252566.

The product of its digits is 1049760, while the sum is 52.

The square root of 169523989 is about 13020.1378256914. The cubic root of 169523989 is about 553.4482956163.

The spelling of 169523989 in words is "one hundred sixty-nine million, five hundred twenty-three thousand, nine hundred eighty-nine".