195151791 has 8 divisors (see below), whose sum is σ = 262505520. Its totient is φ = 128949632.

The previous prime is 195151787. The next prime is 195151799. The reversal of 195151791 is 197151591.

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

It is a cyclic number.

It is not a de Polignac number, because 195151791 - 2² = 195151787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195151799) 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 7 ways as a sum of consecutive naturals, for example, 287496 + ... + 288173.

It is an arithmetic number, because the mean of its divisors is an integer number (32813190).

Almost surely, 2^195151791 is an apocalyptic number.

195151791 is a deficient number, since it is larger than the sum of its proper divisors (67353729).

195151791 is a wasteful number, since it uses less digits than its factorization.

195151791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575785.

The product of its digits is 14175, while the sum is 39.

The square root of 195151791 is about 13969.6739761528. The cubic root of 195151791 is about 580.0394255800.

The spelling of 195151791 in words is "one hundred ninety-five million, one hundred fifty-one thousand, seven hundred ninety-one".