195834991 has 6 divisors (see below), whose sum is σ = 215256776. Its totient is φ = 178031700.

The previous prime is 195834973. The next prime is 195834997. The reversal of 195834991 is 199438591.

It is not a de Polignac number, because 195834991 - 2¹⁵ = 195802223 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195834997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 809115 + ... + 809356.

Almost surely, 2^195834991 is an apocalyptic number.

195834991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

195834991 is a deficient number, since it is larger than the sum of its proper divisors (19421785).

195834991 is a wasteful number, since it uses less digits than its factorization.

195834991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618493 (or 1618482 counting only the distinct ones).

The product of its digits is 349920, while the sum is 49.

The square root of 195834991 is about 13994.1055805650. The cubic root of 195834991 is about 580.7155170582.

The spelling of 195834991 in words is "one hundred ninety-five million, eight hundred thirty-four thousand, nine hundred ninety-one".