169542009 has 36 divisors (see below), whose sum is σ = 306800676. Its totient is φ = 89425728.

The previous prime is 169541899. The next prime is 169542013. The reversal of 169542009 is 900245961.

It can be written as a sum of positive squares in 2 ways, for example, as 23736384 + 145805625 = 4872^2 + 12075^2 .

It is not a de Polignac number, because 169542009 - 2¹² = 169537913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (169542049) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9054 + ... + 20519.

It is an arithmetic number, because the mean of its divisors is an integer number (8522241).

Almost surely, 2^169542009 is an apocalyptic number.

It is an amenable number.

169542009 is a deficient number, since it is larger than the sum of its proper divisors (137258667).

169542009 is a wasteful number, since it uses less digits than its factorization.

169542009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29606 (or 29596 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 169542009 is about 13020.8298122662. The cubic root of 169542009 is about 553.4679050041.

The spelling of 169542009 in words is "one hundred sixty-nine million, five hundred forty-two thousand, nine".