195639253 has 2 divisors, whose sum is σ = 195639254. Its totient is φ = 195639252.

The previous prime is 195639251. The next prime is 195639317. The reversal of 195639253 is 352936591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148401124 + 47238129 = 12182^2 + 6873^2 .

It is a cyclic number.

It is not a de Polignac number, because 195639253 - 2¹ = 195639251 is a prime.

Together with 195639251, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195639251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97819626 + 97819627.

It is an arithmetic number, because the mean of its divisors is an integer number (97819627).

Almost surely, 2^195639253 is an apocalyptic number.

It is an amenable number.

195639253 is a deficient number, since it is larger than the sum of its proper divisors (1).

195639253 is an equidigital number, since it uses as much as digits as its factorization.

195639253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 218700, while the sum is 43.

The square root of 195639253 is about 13987.1102447932. The cubic root of 195639253 is about 580.5219765935.

It can be divided in two parts, 1956 and 39253, that added together give a square (41209 = 203²).

The spelling of 195639253 in words is "one hundred ninety-five million, six hundred thirty-nine thousand, two hundred fifty-three".