195390913 has 4 divisors (see below), whose sum is σ = 199077588. Its totient is φ = 191704240.

The previous prime is 195390901. The next prime is 195390919. The reversal of 195390913 is 319093591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64128064 + 131262849 = 8008^2 + 11457^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195390913 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195390919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1843258 + ... + 1843363.

It is an arithmetic number, because the mean of its divisors is an integer number (49769397).

Almost surely, 2^195390913 is an apocalyptic number.

It is an amenable number.

195390913 is a deficient number, since it is larger than the sum of its proper divisors (3686675).

195390913 is an equidigital number, since it uses as much as digits as its factorization.

195390913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3686674.

The product of its (nonzero) digits is 32805, while the sum is 40.

The square root of 195390913 is about 13978.2299666303. The cubic root of 195390913 is about 580.2762388062.

The spelling of 195390913 in words is "one hundred ninety-five million, three hundred ninety thousand, nine hundred thirteen".