195916009 has 3 divisors (see below), whose sum is σ = 195930007. Its totient is φ = 195902012.

The previous prime is 195915989. The next prime is 195916033. The reversal of 195916009 is 900619591.

The square root of 195916009 is 13997.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 95355225 + 100560784 = 9765^2 + 10028^2 .

It is not a de Polignac number, because 195916009 - 2²¹ = 193818857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195916909) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6999 + ... + 20995.

Almost surely, 2^195916009 is an apocalyptic number.

195916009 is the 13997-th square number.

195916009 is the 6999-th centered octagonal number.

It is an amenable number.

195916009 is a deficient number, since it is larger than the sum of its proper divisors (13998).

195916009 is an frugal number, since it uses more digits than its factorization.

195916009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27994 (or 13997 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 40.

The cubic root of 195916009 is about 580.7955877391.

It can be divided in two parts, 19591 and 6009, that added together give a square (25600 = 160²).

The spelling of 195916009 in words is "one hundred ninety-five million, nine hundred sixteen thousand, nine".