169139509 has 16 divisors (see below), whose sum is σ = 212405760. Its totient is φ = 130840560.

The previous prime is 169139497. The next prime is 169139561. The reversal of 169139509 is 905931961.

169139509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 169139509 - 2¹¹ = 169137461 is a prime.

It is a super-2 number, since 2×169139509² = 57216347009522162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169139809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2802 + ... + 18604.

It is an arithmetic number, because the mean of its divisors is an integer number (13275360).

Almost surely, 2^169139509 is an apocalyptic number.

It is an amenable number.

169139509 is a deficient number, since it is larger than the sum of its proper divisors (43266251).

169139509 is a wasteful number, since it uses less digits than its factorization.

169139509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15960.

The product of its (nonzero) digits is 65610, while the sum is 43.

The square root of 169139509 is about 13005.3646238773. The cubic root of 169139509 is about 553.0295724337.

The spelling of 169139509 in words is "one hundred sixty-nine million, one hundred thirty-nine thousand, five hundred nine".