195531839 has 2 divisors, whose sum is σ = 195531840. Its totient is φ = 195531838.

The previous prime is 195531803. The next prime is 195531851. The reversal of 195531839 is 938135591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195531839 - 2¹² = 195527743 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195531839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195531899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97765919 + 97765920.

It is an arithmetic number, because the mean of its divisors is an integer number (97765920).

Almost surely, 2^195531839 is an apocalyptic number.

195531839 is a deficient number, since it is larger than the sum of its proper divisors (1).

195531839 is an equidigital number, since it uses as much as digits as its factorization.

195531839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 44.

The square root of 195531839 is about 13983.2699680726. The cubic root of 195531839 is about 580.4157136594.

The spelling of 195531839 in words is "one hundred ninety-five million, five hundred thirty-one thousand, eight hundred thirty-nine".