195621089 has 2 divisors, whose sum is σ = 195621090. Its totient is φ = 195621088.

The previous prime is 195621077. The next prime is 195621113. The reversal of 195621089 is 980126591.

It is a happy number.

195621089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137358400 + 58262689 = 11720^2 + 7633^2 .

It is an emirp because it is prime and its reverse (980126591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195621089 - 2⁴ = 195621073 is a prime.

It is a super-2 number, since 2×195621089² = 76535220923091842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195621059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97810544 + 97810545.

It is an arithmetic number, because the mean of its divisors is an integer number (97810545).

Almost surely, 2^195621089 is an apocalyptic number.

It is an amenable number.

195621089 is a deficient number, since it is larger than the sum of its proper divisors (1).

195621089 is an equidigital number, since it uses as much as digits as its factorization.

195621089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 195621089 is about 13986.4609176160. The cubic root of 195621089 is about 580.5040099749.

The spelling of 195621089 in words is "one hundred ninety-five million, six hundred twenty-one thousand, eighty-nine".