195256993 has 2 divisors, whose sum is σ = 195256994. Its totient is φ = 195256992.

The previous prime is 195256979. The next prime is 195257017. The reversal of 195256993 is 399652591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174979984 + 20277009 = 13228^2 + 4503^2 .

It is a cyclic number.

It is not a de Polignac number, because 195256993 - 2²⁵ = 161702561 is a prime.

It is not a weakly prime, because it can be changed into another prime (195256973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97628496 + 97628497.

It is an arithmetic number, because the mean of its divisors is an integer number (97628497).

Almost surely, 2^195256993 is an apocalyptic number.

It is an amenable number.

195256993 is a deficient number, since it is larger than the sum of its proper divisors (1).

195256993 is an equidigital number, since it uses as much as digits as its factorization.

195256993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 656100, while the sum is 49.

The square root of 195256993 is about 13973.4388394554. The cubic root of 195256993 is about 580.1436356508.

It can be divided in two parts, 195256 and 993, that added together give a square (196249 = 443²).

The spelling of 195256993 in words is "one hundred ninety-five million, two hundred fifty-six thousand, nine hundred ninety-three".