195341021 has 2 divisors, whose sum is σ = 195341022. Its totient is φ = 195341020.

The previous prime is 195341017. The next prime is 195341051. The reversal of 195341021 is 120143591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179935396 + 15405625 = 13414^2 + 3925^2 .

It is a cyclic number.

It is not a de Polignac number, because 195341021 - 2² = 195341017 is a prime.

It is a super-2 number, since 2×195341021² = 76316228970644882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_10835342 and since 195341021 and 10835342 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195341011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97670510 + 97670511.

It is an arithmetic number, because the mean of its divisors is an integer number (97670511).

Almost surely, 2^195341021 is an apocalyptic number.

It is an amenable number.

195341021 is a deficient number, since it is larger than the sum of its proper divisors (1).

195341021 is an equidigital number, since it uses as much as digits as its factorization.

195341021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 195341021 is about 13976.4452204414. The cubic root of 195341021 is about 580.2268444814.

The spelling of 195341021 in words is "one hundred ninety-five million, three hundred forty-one thousand, twenty-one".