195647791 has 2 divisors, whose sum is σ = 195647792. Its totient is φ = 195647790.

The previous prime is 195647743. The next prime is 195647827. The reversal of 195647791 is 197746591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195647791 - 2⁷ = 195647663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195647701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97823895 + 97823896.

It is an arithmetic number, because the mean of its divisors is an integer number (97823896).

Almost surely, 2^195647791 is an apocalyptic number.

195647791 is a deficient number, since it is larger than the sum of its proper divisors (1).

195647791 is an equidigital number, since it uses as much as digits as its factorization.

195647791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 49.

The square root of 195647791 is about 13987.4154510403. The cubic root of 195647791 is about 580.5304214300.

The spelling of 195647791 in words is "one hundred ninety-five million, six hundred forty-seven thousand, seven hundred ninety-one".