195538949 has 2 divisors, whose sum is σ = 195538950. Its totient is φ = 195538948.

The previous prime is 195538927. The next prime is 195538951. The reversal of 195538949 is 949835591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158936449 + 36602500 = 12607^2 + 6050^2 .

It is a cyclic number.

It is not a de Polignac number, because 195538949 - 2¹² = 195534853 is a prime.

Together with 195538951, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195538949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195538649) 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, 97769474 + 97769475.

It is an arithmetic number, because the mean of its divisors is an integer number (97769475).

Almost surely, 2^195538949 is an apocalyptic number.

It is an amenable number.

195538949 is a deficient number, since it is larger than the sum of its proper divisors (1).

195538949 is an equidigital number, since it uses as much as digits as its factorization.

195538949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 53.

The square root of 195538949 is about 13983.5241981412. The cubic root of 195538949 is about 580.4227486701.

It can be divided in two parts, 1955 and 38949, that added together give a palindrome (40904).

The spelling of 195538949 in words is "one hundred ninety-five million, five hundred thirty-eight thousand, nine hundred forty-nine".