195895621 has 2 divisors, whose sum is σ = 195895622. Its totient is φ = 195895620.

The previous prime is 195895591. The next prime is 195895627. The reversal of 195895621 is 126598591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139570596 + 56325025 = 11814^2 + 7505^2 .

It is a cyclic number.

It is not a de Polignac number, because 195895621 - 2⁹ = 195895109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195895627) 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, 97947810 + 97947811.

It is an arithmetic number, because the mean of its divisors is an integer number (97947811).

Almost surely, 2^195895621 is an apocalyptic number.

It is an amenable number.

195895621 is a deficient number, since it is larger than the sum of its proper divisors (1).

195895621 is an equidigital number, since it uses as much as digits as its factorization.

195895621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 46.

The square root of 195895621 is about 13996.2716821302. The cubic root of 195895621 is about 580.7754402087.

It can be divided in two parts, 1958 and 95621, that added together give a palindrome (97579).

The spelling of 195895621 in words is "one hundred ninety-five million, eight hundred ninety-five thousand, six hundred twenty-one".