195291993 has 16 divisors (see below), whose sum is σ = 282473856. Its totient is φ = 119299200.

The previous prime is 195291989. The next prime is 195292007. The reversal of 195291993 is 399192591.

It is not a de Polignac number, because 195291993 - 2² = 195291989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (195291953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12933 + ... + 23618.

It is an arithmetic number, because the mean of its divisors is an integer number (17654616).

Almost surely, 2^195291993 is an apocalyptic number.

195291993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

195291993 is a deficient number, since it is larger than the sum of its proper divisors (87181863).

195291993 is a wasteful number, since it uses less digits than its factorization.

195291993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36704.

The product of its digits is 196830, while the sum is 48.

The square root of 195291993 is about 13974.6911593781. The cubic root of 195291993 is about 580.1782973443.

The spelling of 195291993 in words is "one hundred ninety-five million, two hundred ninety-one thousand, nine hundred ninety-three".