195009709 has 16 divisors (see below), whose sum is σ = 206502912. Its totient is φ = 183794688.

The previous prime is 195009707. The next prime is 195009713. The reversal of 195009709 is 907900591.

It is a cyclic number.

It is not a de Polignac number, because 195009709 - 2¹ = 195009707 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 (195009701) 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, 874372 + ... + 874594.

It is an arithmetic number, because the mean of its divisors is an integer number (12906432).

Almost surely, 2^195009709 is an apocalyptic number.

It is an amenable number.

195009709 is a deficient number, since it is larger than the sum of its proper divisors (11493203).

195009709 is a wasteful number, since it uses less digits than its factorization.

195009709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 195009709 is about 13964.5876774075. The cubic root of 195009709 is about 579.8986237800.

The spelling of 195009709 in words is "one hundred ninety-five million, nine thousand, seven hundred nine".