195844139 has 2 divisors, whose sum is σ = 195844140. Its totient is φ = 195844138.

The previous prime is 195844127. The next prime is 195844141. The reversal of 195844139 is 931448591.

195844139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195844139 - 2⁴ = 195844123 is a prime.

Together with 195844141, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195844139.

It is not a weakly prime, because it can be changed into another prime (195844109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97922069 + 97922070.

It is an arithmetic number, because the mean of its divisors is an integer number (97922070).

Almost surely, 2^195844139 is an apocalyptic number.

195844139 is a deficient number, since it is larger than the sum of its proper divisors (1).

195844139 is an equidigital number, since it uses as much as digits as its factorization.

195844139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 195844139 is about 13994.4324286482. The cubic root of 195844139 is about 580.7245591993.

The spelling of 195844139 in words is "one hundred ninety-five million, eight hundred forty-four thousand, one hundred thirty-nine".