195661547 has 2 divisors, whose sum is σ = 195661548. Its totient is φ = 195661546.

The previous prime is 195661537. The next prime is 195661549. The reversal of 195661547 is 745166591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195661547 - 2²⁴ = 178884331 is a prime.

Together with 195661549, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 195661498 and 195661507.

It is not a weakly prime, because it can be changed into another prime (195661549) 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, 97830773 + 97830774.

It is an arithmetic number, because the mean of its divisors is an integer number (97830774).

Almost surely, 2^195661547 is an apocalyptic number.

195661547 is a deficient number, since it is larger than the sum of its proper divisors (1).

195661547 is an equidigital number, since it uses as much as digits as its factorization.

195661547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 195661547 is about 13987.9071701238. The cubic root of 195661547 is about 580.5440268129.

The spelling of 195661547 in words is "one hundred ninety-five million, six hundred sixty-one thousand, five hundred forty-seven".