195170621 has 2 divisors, whose sum is σ = 195170622. Its totient is φ = 195170620.

The previous prime is 195170587. The next prime is 195170627. The reversal of 195170621 is 126071591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194044900 + 1125721 = 13930^2 + 1061^2 .

It is an emirp because it is prime and its reverse (126071591) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195170621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195170627) 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, 97585310 + 97585311.

It is an arithmetic number, because the mean of its divisors is an integer number (97585311).

Almost surely, 2^195170621 is an apocalyptic number.

It is an amenable number.

195170621 is a deficient number, since it is larger than the sum of its proper divisors (1).

195170621 is an equidigital number, since it uses as much as digits as its factorization.

195170621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 32.

The square root of 195170621 is about 13970.3479197907. The cubic root of 195170621 is about 580.0580807869.

The spelling of 195170621 in words is "one hundred ninety-five million, one hundred seventy thousand, six hundred twenty-one".