195449057 has 2 divisors, whose sum is σ = 195449058. Its totient is φ = 195449056.

The previous prime is 195449053. The next prime is 195449071. The reversal of 195449057 is 750944591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172370641 + 23078416 = 13129^2 + 4804^2 .

It is an emirp because it is prime and its reverse (750944591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195449057 - 2² = 195449053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 195448999 and 195449017.

It is not a weakly prime, because it can be changed into another prime (195449053) 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, 97724528 + 97724529.

It is an arithmetic number, because the mean of its divisors is an integer number (97724529).

Almost surely, 2^195449057 is an apocalyptic number.

It is an amenable number.

195449057 is a deficient number, since it is larger than the sum of its proper divisors (1).

195449057 is an equidigital number, since it uses as much as digits as its factorization.

195449057 is an odious number, because the sum of its binary digits is odd.

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

The square root of 195449057 is about 13980.3096174584. The cubic root of 195449057 is about 580.3337922085. Note that the first 3 decimals are identical.

The spelling of 195449057 in words is "one hundred ninety-five million, four hundred forty-nine thousand, fifty-seven".