195979871931 has 8 divisors (see below), whose sum is σ = 272667648000. Its totient is φ = 124972671912.

The previous prime is 195979871921. The next prime is 195979871953. The reversal of 195979871931 is 139178979591.

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

It is not a de Polignac number, because 195979871931 - 2⁷ = 195979871803 is a prime.

It is a super-2 number, since 2×195979871931² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (69), and also a Moran number because the ratio is a prime number: 2840287999 = 195979871931 / (1 + 9 + 5 + 9 + 7 + 9 + 8 + 7 + 1 + 9 + 3 + 1).

It is not an unprimeable number, because it can be changed into a prime (195979871921) 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, 1420143931 + ... + 1420144068.

It is an arithmetic number, because the mean of its divisors is an integer number (34083456000).

Almost surely, 2^195979871931 is an apocalyptic number.

195979871931 is a deficient number, since it is larger than the sum of its proper divisors (76687776069).

195979871931 is a wasteful number, since it uses less digits than its factorization.

195979871931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840288025.

The product of its digits is 38578680, while the sum is 69.

The spelling of 195979871931 in words is "one hundred ninety-five billion, nine hundred seventy-nine million, eight hundred seventy-one thousand, nine hundred thirty-one".