195980991 has 8 divisors (see below), whose sum is σ = 275061120. Its totient is φ = 123777432.

The previous prime is 195980989. The next prime is 195981017. The reversal of 195980991 is 199089591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 195980991 - 2¹ = 195980989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195981991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1719075 + ... + 1719188.

It is an arithmetic number, because the mean of its divisors is an integer number (34382640).

Almost surely, 2^195980991 is an apocalyptic number.

195980991 is a deficient number, since it is larger than the sum of its proper divisors (79080129).

195980991 is a wasteful number, since it uses less digits than its factorization.

195980991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438285.

The product of its (nonzero) digits is 262440, while the sum is 51.

The square root of 195980991 is about 13999.3210906815. The cubic root of 195980991 is about 580.8597939724.

The spelling of 195980991 in words is "one hundred ninety-five million, nine hundred eighty thousand, nine hundred ninety-one".