195398431291 has 8 divisors (see below), whose sum is σ = 223419819744. Its totient is φ = 167403874560.

The previous prime is 195398431279. The next prime is 195398431301. The reversal of 195398431291 is 192134893591.

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-195398431291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195398431211) 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, 6692320 + ... + 6721453.

It is an arithmetic number, because the mean of its divisors is an integer number (27927477468).

Almost surely, 2^195398431291 is an apocalyptic number.

195398431291 is a deficient number, since it is larger than the sum of its proper divisors (28021388453).

195398431291 is a wasteful number, since it uses less digits than its factorization.

195398431291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13415861.

The product of its digits is 2099520, while the sum is 55.

The spelling of 195398431291 in words is "one hundred ninety-five billion, three hundred ninety-eight million, four hundred thirty-one thousand, two hundred ninety-one".