169868609 has 4 divisors (see below), whose sum is σ = 170573700. Its totient is φ = 169163520.

The previous prime is 169868603. The next prime is 169868627. The reversal of 169868609 is 906868961.

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 46036225 + 123832384 = 6785^2 + 11128^2 .

It is a cyclic number.

It is not a de Polignac number, because 169868609 - 2⁸ = 169868353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169868603) 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, 352184 + ... + 352665.

It is an arithmetic number, because the mean of its divisors is an integer number (42643425).

Almost surely, 2^169868609 is an apocalyptic number.

It is an amenable number.

169868609 is a deficient number, since it is larger than the sum of its proper divisors (705091).

169868609 is an equidigital number, since it uses as much as digits as its factorization.

169868609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705090.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 169868609 is about 13033.3652216149. The cubic root of 169868609 is about 553.8230710015.

It can be divided in two parts, 1698 and 68609, that added together give a palindrome (70307).

The spelling of 169868609 in words is "one hundred sixty-nine million, eight hundred sixty-eight thousand, six hundred nine".