195999143 has 4 divisors (see below), whose sum is σ = 202321728. Its totient is φ = 189676560.

The previous prime is 195999131. The next prime is 195999149. The reversal of 195999143 is 341999591.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195999143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 195999091 and 195999100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195999149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3161246 + ... + 3161307.

It is an arithmetic number, because the mean of its divisors is an integer number (50580432).

Almost surely, 2^195999143 is an apocalyptic number.

195999143 is a deficient number, since it is larger than the sum of its proper divisors (6322585).

195999143 is an equidigital number, since it uses as much as digits as its factorization.

195999143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6322584.

The product of its digits is 393660, while the sum is 50.

The square root of 195999143 is about 13999.9693928237. The cubic root of 195999143 is about 580.8777267345.

The spelling of 195999143 in words is "one hundred ninety-five million, nine hundred ninety-nine thousand, one hundred forty-three".