195809623 has 2 divisors, whose sum is σ = 195809624. Its totient is φ = 195809622.

The previous prime is 195809569. The next prime is 195809633. The reversal of 195809623 is 326908591.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195809623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195809623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195809633) 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, 97904811 + 97904812.

It is an arithmetic number, because the mean of its divisors is an integer number (97904812).

Almost surely, 2^195809623 is an apocalyptic number.

195809623 is a deficient number, since it is larger than the sum of its proper divisors (1).

195809623 is an equidigital number, since it uses as much as digits as its factorization.

195809623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 195809623 is about 13993.1991695966. The cubic root of 195809623 is about 580.6904411388.

The spelling of 195809623 in words is "one hundred ninety-five million, eight hundred nine thousand, six hundred twenty-three".