195720099 has 16 divisors (see below), whose sum is σ = 276705792. Its totient is φ = 122629248.

The previous prime is 195720097. The next prime is 195720103. The reversal of 195720099 is 990027591.

It is a Cunningham number, because it is equal to 13990²-1.

It is not a de Polignac number, because 195720099 - 2¹ = 195720097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195720099.

It is not an unprimeable number, because it can be changed into a prime (195720097) 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, 39642 + ... + 44304.

It is an arithmetic number, because the mean of its divisors is an integer number (17294112).

Almost surely, 2^195720099 is an apocalyptic number.

195720099 is a deficient number, since it is larger than the sum of its proper divisors (80985693).

195720099 is a wasteful number, since it uses less digits than its factorization.

195720099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5506.

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 195720099 is about 13989.9999642602. Note that the first 4 decimals coincide. The cubic root of 195720099 is about 580.6019305830.

The spelling of 195720099 in words is "one hundred ninety-five million, seven hundred twenty thousand, ninety-nine".