195478949 has 2 divisors, whose sum is σ = 195478950. Its totient is φ = 195478948.

The previous prime is 195478883. The next prime is 195478951. The reversal of 195478949 is 949874591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175960225 + 19518724 = 13265^2 + 4418^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195478949 is a prime.

Together with 195478951, 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 = 195478894 and 195478903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195478979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97739474 + 97739475.

It is an arithmetic number, because the mean of its divisors is an integer number (97739475).

Almost surely, 2^195478949 is an apocalyptic number.

It is an amenable number.

195478949 is a deficient number, since it is larger than the sum of its proper divisors (1).

195478949 is an equidigital number, since it uses as much as digits as its factorization.

195478949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 56.

The square root of 195478949 is about 13981.3786516209. The cubic root of 195478949 is about 580.3633761381.

The spelling of 195478949 in words is "one hundred ninety-five million, four hundred seventy-eight thousand, nine hundred forty-nine".