195747051491 has 8 divisors (see below), whose sum is σ = 197252852160. Its totient is φ = 194242644648.

The previous prime is 195747051433. The next prime is 195747051553. The reversal of 195747051491 is 194150747591.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195747051491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195747051991) 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, 65621 + ... + 629126.

It is an arithmetic number, because the mean of its divisors is an integer number (24656606520).

Almost surely, 2^195747051491 is an apocalyptic number.

195747051491 is a deficient number, since it is larger than the sum of its proper divisors (1505800669).

195747051491 is a wasteful number, since it uses less digits than its factorization.

195747051491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696913.

The product of its (nonzero) digits is 1587600, while the sum is 53.

The spelling of 195747051491 in words is "one hundred ninety-five billion, seven hundred forty-seven million, fifty-one thousand, four hundred ninety-one".