195232561 has 2 divisors, whose sum is σ = 195232562. Its totient is φ = 195232560.

The previous prime is 195232559. The next prime is 195232567. The reversal of 195232561 is 165232591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185504400 + 9728161 = 13620^2 + 3119^2 .

It is a cyclic number.

It is not a de Polignac number, because 195232561 - 2¹ = 195232559 is a prime.

Together with 195232559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (195232567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97616280 + 97616281.

It is an arithmetic number, because the mean of its divisors is an integer number (97616281).

Almost surely, 2^195232561 is an apocalyptic number.

It is an amenable number.

195232561 is a deficient number, since it is larger than the sum of its proper divisors (1).

195232561 is an equidigital number, since it uses as much as digits as its factorization.

195232561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 195232561 is about 13972.5645820658. The cubic root of 195232561 is about 580.1194373531.

The spelling of 195232561 in words is "one hundred ninety-five million, two hundred thirty-two thousand, five hundred sixty-one".